Midoriya Izuku born as a pure-blood vampire during an age when humans had super-powers called quirks.
Even the young vampire don't had quirks at birth, by human terms, this don't mean that he cannot inherit and learn the black magic of two ancient sorcerers: The Dark Chaos Mage of Destruction, Dark Schneider; and the Witcher Signs Magic from Geralt of Rivia.
When Izuku are admitted on Yuuei, as one of the rare vampire and wizard students on the prestigious Hero Course, and faces a formidable powerful enemy, Anthrax, he faces a dangerous dilemma: it will be a supernatural Pro-Hero or a Doomsday Monster ?

It contains a mild cross-over from Bastard!, Hellsing, Witcher and Berserk, along the My Hero Academia story setting.

Please enjoy!

Edit: Updated version with some additional corrections.

Prelude...

This is a Society dominated by people with super-powers, also called quirks. Due to the genetic dominance of quirks, it takes less than two centuries to the quirk people dominate the main population, reaching more than 80% of world population. However, anyone without a quirk are relegated to become second-class citizens. In theory, the quirkless people should have the same rights of the quirk users, however the discrimination and gradual ostracism drive them to own downfall.

However the Quirks was not the only source of super-powers, albeit it constitute the majority. On a very small quantity, less than one per million in average, a volatile mixture of vampires, sorcerers and witches still survive, and any of them could easily defeat the great majority of quirk users.

One of the most bizarre combinations was a so-called quirkless child, named Izuku Midoriya, which born as a vampire, and been descendent from an ancient lineage of vampires from his mother Inko, and an exotic combination of wizards, or sorcerers from the deceased father side, or Inko thought, since he was reported missed once he fells ill when Inko was pregnant, and he's missing since then.

Usually vampires don't possess the ability to inheriting a human quirk, although some recent reports shows that already happens on some younger ones, specially if one of his parents was an human one. The same occurs to old mages bloodlines, making a hybrid magic and quirk users, where requires specially lectures during their childhood. Quirk or Quirkless, the majority of vampires powers has mistaken by some form of telekinesis quirk, or an enhanced strength quirk, even both. A reason of this fact was due to vampires had a natural physical force, that was about 20 times greater than the average human, taking down several quirked humans without great problems, unless a human with a powerful strength quirk exists to counter them.

When the authorities notice that some quirkless had non-quirk special powers, they amend the Quirk Registration Law to include additional fields related to abnormal physic features, or even magic abilities, to made a legal equivalence between Magic and Quirks. Those amendments, makes illegal misuse of Magic punishable like the Quirks.

The young Izuku was a young vampire that was strong by own physical power, about three times the average of a four years old child. That biological advantage was shattered, when his childhood human friend named Katsuki Bakugou, that also reaches 4 years old, develops an Explosion Quirk that could overcome him. When Katsuki likes to tease and bully the young vampire, it shouts when Izuku uses their physical strength to dash quickly to his house.

"Stupid Deku!", Katsuki grins when exhibits his tiny flame bursts, "My quirk is so much cooler than your weak one!"

"It is so cruel… Kacchan!", says Izuku a little hurt, while sprints to get home as soon as possible.

A regular health check routine shows that was, by human standards, quirkless and this could make their life during the Elementary School a little harder. Since Izuku was a vampire, his non-quirk powers would overcome and compensate the lack of a human quirk. Izuku's mother teaches some forms of self-defence, later carried by a rare trustful quirkless human Vigilante by the Vampire Community. Knuckleduster was a martial arts expert, and exploits the major flaws on human glorification of quirk users. Many of them forgot to enhance their physical strength, and then Knuckleduster could quickly take down several quirk users by applying an adequate martial art technique.

"Nowadays any young kids barely studies any kind of martial arts!", speaks Knuckleduster, "They prefer to use those weak wizardly so called quirk, but I will teach you how to overcome about this quickly!"

"Please sensei!", Izuku pledges while bows, "Teach me your best practices!", and raises his head, "Even I'm a vampire, I need strength to overcome my bully!"

"Then the Spartan path may open to you!", and his personal trainer yells, beginning a tour on Hell.

With this, Izuku (or Deku from the Katsuki own perspective) could chop their bully with a powerful physical attack. He mastered the Krav Maga and Jujitsu Martial Arts at age 12, enough to Izuku manage to neutralize the Katsuki's lackeys on a slilly fight, and sending all of them to the hospital.

Quirkless or being a Vampire, that issue don't stop Izuku dreaming to be a Hero, searching every source of material about unusual Pro Heroes, specially the ones with super-natural origins. For his own research, he notices that the Government was legislate about the Vampires and other non-human sentient capable to hybridize with humans. The Vampire Citizenship Law gives some basic rights, in exchange to give to them a special disclosure of their public presence and knowledge, in order to protect them from humans.

One of those rules about young vampires, was the mandatory discretion of their nature along human students during the Elementary and High School. It won't prevent them to some college or the teachers to manifest that one of students are a vampire, but such situations can be either comic, or a dangerous peril. Due to such inconvenience, his teachers recommended that Izuku should be more realistic on their very long future, since his vampiric origins has not much compatible with a Pro Hero career.

Izuku's magic powers awakening process takes some time, and starts when he was about 10 years old, when Izuku had some nightmares (and contrary to public belief, it is normal to vampires had nightmares or mental health issues), that evolve to bad omens. His mother explains that a vampire takes about a century to awake all vampiric powers, and it was a little unusual to manifest some weak kind of telekinesis at that age, since Inko gains his powers when she had 60 years old.

Inko later reads from his deceased husband's old books, that was not born originally as a vampire, since it was bitten by some rogue one. Izuku born as a True Vampire, since his father's human genes was already blocked before he's conceived.

However Izuku receive another set of genes from his father, that was disabled once was a normal human. Hisashi Midoriya (Izuku's father) was a lost descendent from a broken old lineage of sorcerers, a kind of mage with natural affinity with certain Advanced Magic. Izuku was inherited the powers from a Medieval Germanic arch-sorcerer that was nicknamed Dark Schneider, to a Polish witcher which name was recorded as Geralt of Rivia or Gwynbleidd (White Wolf).

"Honey...", speaks his mother, while brings a thermo with hot blood to his son drink, "Recently you had several bad nightmares, but did you remember...", and points to her son's drawings, "The faces of your monsters that you cited..."

"Thanks mom", says Izuku, while bites the thermo seal with his fangs and drank, "What's this ?", and points to the ancient book.

"A old book from your father...", just for Izuku drops his face due to his own angst, as it fells some guilty to his father death, due to some unknown toxin poisoning.

His mother almost jumps backwards when Izuku yells once opens the book, "What is this ?!... It can't be possible!...", while notices the book had a very familiar graphical picture of a mage.

Izuku was in real shock when his mother talks about the fact that his father had sorcerers as ancestors, and became awed since the pictured image of Gwynbleidd or Dark Schneider matches the horrific vision from his bad omens. Some time later, Izuku notices that a third man appears on his visions, and that was an heavy armoured men, carrying an huge sword about the size of himself, while slash against humans and demons. Izuku later called this nameless men as a Berserker.

The next stage occurs when reaches 13 years old, when the ancient triumvirate powers shakes Izuku's body during a terrible night. His mother almost fainted when witness the dark aura and gloomy miasma releasing on his son's bedroom, and once she breaks into the room, she panics when notices that his little son manage to cast a Magic Ritual Spell, almost by his own instincts. Once everything settled, Izuku could drink some hot bloody coffee, and make some breathing exercises to calm down, as he notices with great horror that was made a contract with an unknown dimension, becoming the source of their Magic Powers. And he freezes when notices that one of Hisashi's book was actually a Grimoire, or a Magic Book.

Izuku learns from his mother that vampires are capable to do some simple magic spells, derived from his own special skills and powers. However, Inko notices with great horror that Izuku's newborn magic powers are beyond a standard vampire could do.

When Izuku manages to calms down after the awakening, and makes some experiments, his own mother was a little horrified to witness the affinity of his magic powers matches the Dark Schneider and Gwynbleidd ones, along some unknown factors that Izuku should explore.

Several days of trial and error experiments later motivates Izuku to wrote a revised Grimoire from the father's ancient books, along some ancient esoteric books that Inko could arrange, but translating from German and Polish old books was a tough task, even using computers.

Inko also tries to find a suitable vampire with sorcery knowledge, but waste almost five months to find one, and even so, it takes almost a year to Izuku master the fundamentals of magic, and learn some high profile spells. Izuku takes two full months to control the most basic Dark Schneider's signature spells where during the training it almost cost his life due to malign vitality flow, in sheer contrast to a few days required to master the Gwynbleidd's Signs, which are a kind of spells easily mistaken by a Quirk.

Soon, after six months of training, Izuku could learn a pattern that follows thoughtfully, he use the Witcher Signs mainly for everyday stuff, while some dangerous threats are better handled by Dark Schenider's more powerful spells. His sorcerer teacher also give another grimoire to Izuku learn and cast more inoffensive spells to avoid premature health damage, such as the Elemental Arrows, that Izuku finds to be similar from a magician school anime he saw earlier.

"I'm proud of you", says the private vampire mage, "Using all collected data from your self-learnings and natural affinities, along the things you learn with me, I can say that you are a potential sorcerer capable to manipulate the fire, thunder and darkness."

"Thanks… Witch-sensei!", says Izuku, very tired.

"You can also cast ice, sand and wind spells, although with lesser efficiency.", and concludes with another note, "But light spells are too unnatural to you ever cast. At best of best, you can cast a Light Element Arrow, but nothing more with that Element!"

"Since my husband had a fire quirk, when he was human, and I gain some kind of weak telekinesis as a natural vampire, it make a little sense!", Izuku's mother intervenes happily.

At school...

Izuku sighs during the Aptitude Class that occurs at the beginning of the third year of Junior High School, where every teenager at age 14 should choose his future career, giving the first step by choosing the High School they pretends to go to. Izuku's dream to assign for Yuuei was now more plausible, since magic can mistaken as a powerful quirk (or a 10 to 50-fold multi-quirk user), as their sources was totally different. Quirk powers derive from the human strength and stamina, while sorcery derives from the manipulation of nature and spiritual energies, also called od or mana, depending from the scholars opinion. Izuku prefer the term Vitality, since he likes the Geralt's diary nomenclature.

"Today I will delivery the High School Selection Form to everyone", speaks the schoolroom teacher.

"I bet that the majority wants to be a hero!", says one student.

"Specially me!", said the arrogant blond Katsuki, "I will enter on Yuuei, and became the best, first and most rich Hero!"

"And Midoriya also wants to go to Yuuei!", said the teacher.

Everyone on class mutes, and then Katsuki glares furiously, while yells, "How an almost quirkless weakling, since I notice a little capability to move things by your ridiculous will", Katsuki notices that Izuku was an odd person, including the telekinesis powers, and vampiric nature, "Can assign to one of best Hero Academia of Japan ?!"

"Hilarious!", said Izuku, "Why you are so unfriendly, since I don't care your opinion!"

"DEKU!", Katsuki slams his right hand.

"Oh great!", Izuku jumps from his chair, and then grabs Katsuki, and pushes to the ground. Finally a swift arm throw against the Katsuki's neck immobilize him, just in time when the teacher intervene.

"Bakugou! Midoriya! You two, stop it!", the teacher yells, "And go now for the principal office! Now!"

Izuku uses his martial arts to handle his bully, but both receive a full week suspension due to the fight. Izuku knows that it can be a very bad day, specially the hunger for blood increases when it was mentally altered.

And since he is also a powerful sorcerer and vampire, this kind of awkward situations can be a trigger for a disastrous problem.

Once Izuku tries to calm down, he walks nervously to home, but his own prognosis about a bad day could be true.

Villain Slime Disaster...

He was dashing along the street when a green and putrid slime villain and another red acidic and toxic one decides to ambush and attacks him on a coordinated attack. Izuku barely had time to dodge.

About half kilometre away, Katsuki walks along his lackeys, and curses about everything, "Stupid Deku! He's no more than a stupid weakling!".

One of Katsuki's lackeys notices and warns that his favourite green hair person being absorve by two mutant villains, "Damn it... Deku!", without hiding the panic and slight remorse he manifest.

"Damn!", Izuku reacts while it was subduct by the villains, "Physical attacks do not work!"

"Relax… By boy! It will...", says the green slime.

"Takes 45 seconds!", and the red concludes.

"Even many quirk users won't escape by this trap...", Izuku mumbles almost suffocating.

The red slime became panicked when notices the victim was actually a vampire, "What... ?!", when notice the abnormal physiognomy of izuku's body, and reverts partially the slime liquification.

The awkward situation gave an opportunity to Izuku drop his fangs to attack the partial regenerated human arm and drink his blood. The green slime pulls Izuku, giving time for the red one return to the fully slime form.

Izuku casts the Witcher Sign Axii almost in panic, in order to try confusing the slimes, but also switch almost instinctively the pyrokinetic Sign Igni, to burn the smiles weak spots, in order to help him to escape. Each active Sign mark around the target places a small circle with a rune symbol on the middle, where it glows once the spell are cast.

The civilian witness mesmerized and in panic, the unfolding of the unusual abilities of a Junior High School student. Quirks are very common on their ages, and displaying them was a ritual of initialization to achieve their dreams to be heroes. But the strange and unnatural energy flow of Signs, even to the worried Katsuki who runs to reach Izuku, was causing great anxiety.

"A mind-bending magic spell are very useful with such issues...", Izuku sighs while remember a page from his handwritten grimoire from memory.

Since the slimes suffer a slight mental breakdown, it gives the opportunity for Izuku's own aura creates a vacuum, while uses the Witcher Sign Aard, that is a telekinesis magic spell, to separate him from the fused slimes, and eject violently from them.

The Katsuki's lackeys reaches first to the incident scene, without stare in state of shock, "What ?! He manage to blast away ?!"

Izuku was terrible in a very mad mood, even he could escape, the villains could try to recover the victim. Since he was now free, Izuku don't waste the brief window time to recite tenaciously a memorized page of his grimoire, as he closed his hands, interlacing his fingers, close partially his eyes, while meditates to enable him to cast a spell.

"What the hell ?!", says one of the villain slimes.

"How you manage to release free from us ?!", said another.

"Both of you are terrible wrong if you think that I should leave you alive...", Izuku slips from his normal demeanour to a more cruel punisher.

"WTF is happening ?!", said Katsuki when arrive to the crowd, and notice the murderous rage emanating from the young vampire.

"Sasado! Sasado! Schrono! Chronos! Yoku-Sukou!", Izuku meditates while a glowing ball of dark energy forms on front on him, "Burning from the depths of Hell! Unleash the Black Mist of Hellfire! May the Underworld Fire become my sword and punish the Enemy!", then Izuku open his arms and unleash the magic energy to outside from the his right hand, burning the slimes alive, "VENOM!"

A second later, the fused slimes burns and explodes, releasing reddish pitch black flames, hotter than the surface temperatures of the Sun. The vicinity buildings suffer some minor damages, such some broken windows, while some cars stationed on the parking areas along the street blasts due to the massive heat. Some ornamental trees and bushes located around the cars also catches fire. But the major effect of this magic spell was the villains spilled blood burns and their entire bodies melts, and spontaneously combust, just to end reduce to ash and burned grease.

Izuku quickly use his left hand to cast the telekinesis Witcher Sign Aard, to create a blast capable to end the minor fires, without avoiding another damage made by the debris blast. Seconds later, a muscular Hero appears in the middle of chaos and quickly stares Izuku once he killed the villains, while ears the strange enchantment made when he casts the spells. All Might tries to understand about it while murmurs, "Reciting to release his quirk ?!"

A little behind from the back of Izuku, was Katsuki and two lackeys, starring both in shock and panic.

Before Katsuki could speak anything, another villain emerges and roams against the green hair sorcerer. It was already activate his Gigantification and Ember quirks, while becomes a kind of titan monster. "So you have a fire-type Quirk!"

In a blink of an eye, the main villain shout his embers around the young vampire sorcerer.

The flames from his foe are very hot, but Izuku activate the Magic Trap Sign Yrden, and the Magic Shield Quen to isolate himself from the blazing inferno.

"Today it is not my day!", Izuku yells as notices the bad conditions on his peace of mind reduces dangerously the accuracy and precision of Izuku's magic spells, "However you are totally wrong about my real powers..."

"What ?!", the villain makes a confused grin, just to poke fun, and display a poker-face by purpose.

"Even I could use all the Gwynbleidd's Signs for a single event, in some cases, like you, are not enough, but I will show to you what happens when you choose the wrong person to make your villainy!"

"Gw… What ?!", Katsuki snaps while notices the strange rune symbols around Izuku that was shield him against the flames.

"So your Quirk enables to create shield against quirk attacks ?!", the monster villain grins maliciously, and them smashes against the floor, "But you can't escape from my flamethrower attack!"

Izuku blasts away to the air due to recoil, while cross his arms and legs to regain balance, and escape from the flames.

"First of all, I'm not limited to fire techniques...", as Izuku begins to meditate again, once recovers some necessary concentration, "Slayerd! Slayerd! Great Guardian of Black Mist!", while a strange ball of dark energy forms and holds on mid-air, about five meters ahead from Izuku point of view, while his eyes flashes red, and wraps his members, "Dark Thunder of Balmor, I summon you to Honour your Blood Pact!", while the villain, All Might and even Katsuki tries to understand about the strange requirement to spell a kind of mantra, "Come Lightning from the Darkness and Strike!", and Izuku discharges a kind of electric bolt while jumps for better strike accuracy, coated with fire and some kind of dark miasma, along a air pressure wave, "BALVOLT!"

The last Izuku's magic spell cause a great damage to the villain, and screams with pain, "Changing from fire to electricity ?!"

"Are you done ?!", Izuku said with great rage, while his anger explodes, since it was a very bad day, causing an increasing thirsty for blood, forming a disastrous chain of events, that ends to be fuel to a more powerful spell.

"Second thing, I'm a sorcerer! I don't have a Quirk per se, but I can cast spells!... Since I'm a mage!...", Izuku explains while lands on land, after some mid-air back flips, "And also a very angry… vampire!"

"What ?!", both exclaimed, including the villain, All Might and Katsuki.

The villain exclaims about non-sense and throws another flame blast, just to saw the vampire cast another deadly magic spell:

"And finally, the third and last thing, never pull an enraged mage to your playground, since it could be deadly...", and Izuku uses his mad moment to cast a powerful and destructive magic spell, "Brain... Brain… Dead!", Izuku aura explodes, while his green hair expands along the vitality line flows, "Obey your blood oath and come forth from the Land of Abaddon!", and a huge energetic pulse blasts the soil, and begins to fire, "Liberate the Gehenna's Fire that incinerate at all it touches!", and a tsunami of fire falls from a portal open from Hell, "Give the Evil Blaze of Burning to destroy and burn everything at will!", and finally the giant villain ends incinerated alive, "EXODUS!"

The new Izuku's fire spell was terrible hotter, capable to turn stone into lava, and burns even the most fire-resistant monster or quirk until left ashes. The former villain was not exception, it turns into charcoal in less that five seconds, with temperatures reaching above 100.000 Kelvin.

The last civilian witness that still watches the stand off between the former villains runs away in a surge wave of pure panic. Many of them never witness such manifestation of power.

All Might grabs the Izuku's wrist and yells, "Mister! What the HELL you make ?!"

Izuku ends tired for the use of three massive spells, but still had forces to answer, "Dark Schneider Grimoire: Gehenna's Fire, Exodus!"

"What… the… hell… are… you ?!", Katsuki in total denial, shock and fear, "You're not a Hero!", and screams with agony and tears, "You are… a MURDERER!"

"I'm don't want to kill them, but I couldn't avoid to do so!", Izuku glares, "I saw bloodlust on him, then I use my powerful techniques...", and his mood breaks.

"Boy!", All Might holds the grip on his right wrist, "I understand that you claims your acts as justifiable for self-defence! But the case don't require lethal force!"

Izuku then breaks down in tears, since their anger was finally consumed, "I'm so sorry... All Might!"

Other Pro Heroes arrive, and became mesmerized to witness three powerful villains to burn into ashes, and a young boy was the one that destroy them.

Returning at Home...

Once the police finishes to handle the situation, Izuku could return to home, but his mother was terrible upset about the whole situation. The school week suspension was partially manageable, but the three villains brutal execution deserves a serious talk.

"Izuku", says the mother in a serious tone, "Why do you make this horrible thing ?", and mellows a little, "It could be bad villains, but kill them in such brutal way are totally wrong."

"Sorry mom", Izuku now was face sullen, with tears along the eyes, "The first ones tries to kill me, so… I...", and sobs, "I escape using the Witcher Signs..."

"So why ?", his mother asks, "You could simply flee..."

"I saw Kacchan along the witnesses, but my rage takes the lead, and..."

"You use one of your signature magic spells...", his mother concludes the sentence, "Ending with a brutal death by fire."

"I'm so sorry...", Izuku cries, while his fangs drops down.

"The police said that the use of this spells, even for self-defence, was brutally exaggerated, but it appears the villains are just lackeys to an infamous kidnapper, that was the third one, and you don't have further penalty.", Inko sighs, "However, I need to update your Quirk Registry as Magician, at least with the main powers!"

Izuku nods, while his mother give a fresh Thermos with blood mixed with cold tea to calm down the huge anxiety, ending with a bottle of fresh water.

Meanwhile Katsuki was also in pain, since he never expect that Izuku's real powers could be so deadly. He knows, since he knows Inko Midoriya personally, that Izuku was a vampire, and so have some kind of non-quirk special powers. But sorcery was beyond the cogitation, specially when witness two massive fire spells, and an electric one. He knows that even own quirk is Fire Element by some cruel coincidence, but is nowhere capable to burn anything into dust.

Even it calls Izuku a murderer, he know that due from the heat of event, since Izuku also breaks down in pain, as notices that he jump to a borderline unjustifiable act.

With this new powers, Izuku could apply to Yuuei, but the problem is the new sorcerer powers, that in 99% of Hero Missions are not simply applicable, since it could simply destroy the villains, hostages, the site and all the innocences in a single blow.

But it will be the next step to make.

To be Continued...