Berserker
Illyasviel von Einzbern was very motivated to summon a Servant. After all, she had been locked out of the warm castle, in the middle of cold winter, with nothing but the nightgown on her back, a relic and a bucket of blood, wherever it came from, until she did summon a heroic spirit. Even worse, the smell of the blood was bound to attract the attention of the wolves in the forest, which started right next to the aforementioned castle's walls. And as powerful as she was, she doubted she could survive a contact with a hungry pack unscathed...
Quickly drawing the summoning circle, the Einzbern homunculus began chanting the aria. With the relic Jubstacheit had given her, Ilya had no doubts that she will summon one of most powerful heroes of all times, Heracles.
Though as the ritual reached its climax, she could not see a mountain of muscles that her servant should be through the smoke. Instead, there was someone smaller, and definitely of a much leaner build... As the fake smoke began dissipating, the white-haired girl could finally study the servant she had summoned properly.
He was a six-feet-tall man in his early thirties with short spiky dirty-blond hair and blue eyes. Though the left one was bloodshot and appeared to be almost red. His clothes consisted of slightly-tattered black leather coat, black leather pants and black combat boots. There also was some sort of an assault rifle on his back...
While this man definitely didn't look as legendary and impressive as the old-times heroes from various legends, the almost visible aura of power that surrounded him made it clear that he was just as dangerous as any other spirit from the Throne of Heroes. And Ilya had to admit – just to herself – that whenever she looked into the man's bloodshot left eye, she could feel primal fear gripping her very soul.
"So, I s'pose you are my Master, little girl." The summoned heroic spirit stated bluntly after he looked around. Ilya huffed in annoyance at being called that – true, her body was indeed that of a little girl, but, damn it, she was seventeen! – but still confirmed that with a nod. "Let's get somewhere warm then, you'll freeze to death in these clothes of yours." He said then while removing his coat and handing it over to his petite Master.
Wrapping herself up in her Servant's coat, Ilya began walking back towards the Einzbern castle, deep in her thoughts. She was quite sure that Jubstacheit would be far from impressed with the heroic spirit she managed to summon, and he'll most likely be very disappointed that she had failed to summon Heracles even with the catalyst he had provided her with... But, at the same time,.. The man would have no other options but to allow her in – even in his own castle, it was doubtful that he'd be able to match whichever heroic spirit that was now her Servant.
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Ilya, of course, knew about the dream sequences that allowed a Master and a Servant to see the glimpses of the most important events of each others' lives. But since those, obviously, were different for each Master and each Servant, the homunculus girl didn't really know what to actually expect from these dream sequences... Thus, when she actually had those, she was quite surprised by what she saw.
As it turned out, Berserker was a heroic spirit not from the past, but actually from an alternative near future, where the world became shattered into a number of small countries that were fighting wars against each other for the territories and the remaining resources. Even more surprising – to Ilya – was the fact that her Servant was originally nothing more than a young man working at a gas station in some back country.
Or that was so until one day he had helped a colonel to deal with some brain-dead brutes who tried to rob the said officer. The colonel had been quite impressed by the brief and brutal fight of the young man and invited him to join some military program that was supposed to prepare the new elites for the country's army. Not having much tying him down to his current place of residence, Berserker had accepted the invitation.
From there on, the dream sequence had shown quite a few scenes from the training Berserker had undergone while at that military camp. And, to be honest, I;ya was rather impressed: back then her Servant was but a simple man, yet his endurance and physical strength were top notch already, which along with his unorthodox fighting style, made him a very dangerous opponent in any kind of a fight...
Then, Ilya was shown the day when her Servant had earned not one, but two monickers that could have been a clue to his real identity, had he been from her world and not from an alternative reality. One of those monickers was 'The God of Death', the other – 'Genocide'.
On that day, a group of rebels had captured a training area where Berserker and a few of his comrades were. But instead of retreating or whatever, her Servant's past self chose to push forward. And after some searches, he managed to locate the commander of the rebels. There was a great fight, by the end of which, it was revealed that this commander was no one other than the colonel who had picked and sponsored Berserker for the military program he was in now. Not to mention, Berserker himself had been of a very high opinion about this man, so seeing him turn a traitor was a devastating blow to him...
Then, a fighting forces of the rebels had swarmed the area. Ilya wasn't really familiar with how military operated, but she could count around eighty riflemen, several jeeps and a few APCs. Yet, instead of surrendering to this force, Berserker, mad from rage and grief, chose to fight. And he had slaughtered them all. He killed all those men, and he was the only one to walk from that battlefield alive; a single man that managed to obliterate a company of trained soldiers.
There have been several more dream sequences, but the events they showed weren't as impressive as this one. Yet, from them Ilya had learned that her Servant preferred to fight alone; and that he was really good with any modern weaponry. But he turned into a literal God of War when he donned his armored suit...
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The final Master of the Fifth Grail War, one Shirou Emiya, was walking back home, deep in his thoughts. His Servant, a blonde girl Saber, was walking besides him, her armor-clad form hidden underneath a yellow raincoat; Toshaka Rin and a Servant of her own were walking a few steps behind them... Shorou desperately wanted this day to end as, hopefully, when he woke up tomorrow, the world would be making more sense to him. Alas, it was not to be as he and his companions ran into another Master – a petite white-haired red-eyed girl who looked like she had just walked out of a tundra.
"Good evening, onii-chan." The girl greeted. "This is the second time we meet." And while the red-haired teen was wondering why this girl was calling him 'onii-chan', Rin, though, seemed to be more interested in the shadowed figure standing behind this girl.
"This is not good, her servant is very strong." The Tohsaka heir commented, her own Servant silently agreeing with her as he was ready to protect his Master.
"Please to meet you, Rin." The unknown girl replied, while doing a reverence. "I'm Ilya. Illyasviel von Einzbern. Understand?" Apparently, the dark-haired beauty knew some secret significance behind that name. "But I don't think any more salutations will be necessary, since you'll all be dying here." Shirou let out a surprised 'ah' at this proclamation. "All right, I'll be killing you then. Do it, Berserker!"
And, suddenly, the figure behind this Illyasviel girl moved, an armored exoskeleton wrapping itself around it. A moment later there was a sound of a gunshot... And Saber was barely fast enough to block a bullet speeding towards her Master's head with her sword. Only, a moment later, the rocket launchers on Berserker's shoulders fired missiles at them. Knowing that she couldn't do anything to stop those, Arturia Pendragon grabbed still-shocked Shirou and jumped away. Then, a powerful explosion tore the street where they had been standing a moment ago.
"Archer." She said to the white-haired Servant, though she never took her eyes of this strange Berserker. "As much as I don't want to admit it, this guy might be a little beyond me in my current state; since he was tasked with eliminating both of our Masters, I'd like to request your help." The red-and-black clad Servant nodded and was about to project his bow when he noticed a heavy machine gun in Berserker's hands that was trained on him. And even worse, since right now he was standing in front of Rin, Archer couldn't dodge – he had to use his shield if he wanted to survive this attack.
At least, the white-haired Servant hoped that while the modern-era knight was focusing on him, Saber would be able to counterattack. Alas, that was not the case as while Berserker was raining magical bullets upon him, his rocket launchers were still targeting Saber.
"Damn, who the hell are you?" Counter-Guardian EMIYA asked through his clenched teeth as he felt the first of the seven layers of his shield being torn to shreds by the gunfire.
"I'm Genocide." Was the answer he got.
Berserker
True identity: Major Grahad 'Genocide' Mills
Series: "Red eyes"
Age: unknown, ~35
Sex: Male
Alignment: Chaotic Good
Strength: B (A while wearing exoskeleton armor)
Endurance: C (B+ while wearing exoskeleton armor)
Agility: B (B++ while wearing exoskeleton armor)
Mana: C
Luck: C
Independent action: D+
Magic resistance: E+ (*)
Battle Continuation: B
Eye of the Mind (false): C++
Riding: C - Major Mills can operate most modern vehicles that require only one driver.
Lone jackal: B - essentially, this is the opposite of 'Guardian knight' skill: 'Genocide' receives a plus to his Strengths and Agility when his master or allies aren't on the battlefield.
Mystic eye: D - not even magical in nature, Mills' bloodshot left eye somehow still greatly increases the effectiveness of his killing intent if someone is looking into it.
Mad enhancement: D - an abnormal case of mad enhancement. Major Mills received a buff to his Agility instead of Strength. Also, he doesn't lose his ability to think or even communicate normally. However, his bloodlust is greatly increased, making it harder to control him on the battlefield.
Noble Phantasms:
Mk-54 prototype SAA: B, item, support, defensive. An exoskeleton armor, complete with a burst jetpack and multiple mounted weapons, ranging from a railgun to RPG-launchers. Aside from a great firepower and increased maneuverability, this exoskeleton increases major Mills' strength and grants him immunity to both smaller firearms' fire and low-power magical direct-damage attacks. It can also be controlled remotely, though it will not be effective in a combat this way.
Weapons of slaughter: E-C, item collection. Various weapons that 'Genocide' used during his life. Ranges from simple pistols and hand grenades to light machine-guns and anti-material sniper rifles. There is also a 23mm auto-cannon in this collection, but it requires major Mills to wear his exoskeleton armor. All these weapons have been 'upgraded' with increased damage and, in case of firearms, infinite magazines.