Welcome to my newest fanfiction! This is a Fairy Tail x Batman fic with Jason Todd Lives!/Fem!Half-Fire Demon!Natsu

Here's the Summary:

Natsu Dragneel, revived as a demon once again after millennia asleep from her final fight with Zeref, has escaped from the lab she was brought back in and had lived in for seven months (days to her), slightly feral and on the loose in Gotham. As she moves from alley to alley through interconnected tunnels underneath the city, Natsu learns enough when surviving on the streets to be of help to the residents. Because of that, she earned herself the moniker Berserker for her animalistic fighting style and her new appearance- attributes of a Fire Dragon. As she shows herself in fire and rage, she gains the notice of the Dark Knight especially after his protégé, Jason, is saved from death by the Joker because of the flaming hellion he was trying to take down to prove himself to his mentor.

And so yes, he finds the being, but it's not what he expected. A Fire Demon and a Jaybird. Whoda' thunk, eh?

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I: Demon

An incorporated spirit who can actualize in many ways, yet is usually depicted as a grotesque hybrid of Part-Homo Sapiens Part-wild beast that walks upright

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On the first day, heat sparked a memory.

A searing, burning, comforting warmth that fired through her body. Her tail flicked, burning red and black at the end. Her horns glowed like coals in a bellows. Her claws steamed. Her red eyes glowed like red embers. She remembered a man with black hair, smiling tenderly at her. Saying her name.

"Etherious. Natsu. Dragneel."

Her name was Natsu.

On the second day, cold burned her fire.

It burned her, she hurt because of the cold. She quickly grew to hate it whenever her master took her to the cold-boxed-room. He would tell her that it was to help her control her fire, but she knew he was lying. His heart up-ticked after all.

On the third day, hunger made her weak.

Natsu's master never fed her on time nor as much as her body needed. They kept her tired and obedient. When she was unable to complete a task properly, they minimized her portions as punishment. After all, who would feed a demon?

On the fourth day, sadness made her wail.

Natsu's master brought in another demon like herself. It had sun-pretty-sun hair, spotted with black, and wolf-like ears on its head. It's name was Jackal. It was a nice demon, if a tad bit too happy with his curse ability. That was the first and last day she met someone other than her master- they forced her to burn Jackal alive. As she did it, she wailed and cried in apology as he crumbled to nothing but ash and dust.

On the fifth day, pain made her scream.

Strapped to an alter like a lamb to the slaughter. The man who woke her had many sharp blades to use and see just how far her abilities went in terms of healing. The first blow was her right eye. Sliced down like an apple blood flew from the wound but within a time had healed up. Natsu's master mumbled 'five hours for an eye- even then there's a scar.' And picked up a large hammer. Slamming in on her legs and arms, she screeched and hissed and screamed in agony. Twelve days for an arm. Six for a leg. He grabbed her tail and took a large knife, cutting off the tip. Three for the tail. Guns were shot, showing the metal bullets took much much longer- several months. Though she regrows and heals, the physical and mental scars remained. Nights went sleepless soon after this events of several days, if only so Natsu could escape the horrors her dreams wrought her.

On the sixth day, fear made her kill.

They brought in another demon, this one revived from the ice of the far north, according to her Master. It stood as a behemoth, but a pulsing in her core told her that Master didn't want to have it fight her, he wanted it to copulate with her. The demon's name was Deliora. Master ordered it to breed her and create an army of demonic soldiers. As she was held down by a clawed hand, feeling more than hearing the primal grunts as Deliora tried to rip off what was left of her clothing, Natsu's fear made her mind buckle. When she came too, all she could smell was blood. All she could feel was the frigid sticky greed substance dripping from her claw tips. Her horns had chunks of frozen meat on them. Deliora's head was on the ground, staring at her with glazed over eyes. She had slaughtered him.

And on the last day, fury made her free.

Master had become fed up with Natsu's resistance. He strapped her down and began to finish what Deliora had tried to start. In the end, the man had gone insane and tried to breed himself with a demoness. In that moment, Natsu felt pure rage sweep through her, pure fury at the injustice of it all. And with that wrath came time for her to burn

She laughed as she covered him in the ice of the freeze box and made his skin turn black with frostbite. She devoured his arms and legs to replenish meals he so cruelly denied her. She tracked down a member of his research team, one he fancied, and ripped her head off before him. The man's screams were music to her ears as she branded her pain to him with her fire. Finally, Natsu ripped off his genitalia and stuffed it down his throat to repay him for Deliora and his attempted defilement. With clawed feet planted wide, she roared . A pillar of fire shot through the roof above, barreling through many levels and finally showing the blue sky to her for the first time.

Pain in her back made Natsu double over for a brief moment before two crimson and black wings speckled with metallic gold scales unfurled. Driving them down, Natsu flew into the air, higher and higher before she shot into the sky and roared out again. For the next three months, Natsu learned that there were good people and vile, scum-filled people. There were careless, mind-your-own people who spent their days standing in place, and powerful people, people like Batman and his partner, Robin.

Natsu was going to fly. Fly high and fly far with the powerful people.

On the last day, freedom made her soar.

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~One Year Later~

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Natsu yawned as she blinked open reddish-gold eyes. She unwrapped her tail from the rafter and dropped down to the ground forty feet below, opening her wings to slow her decent. Night had fallen upon her city of darkness and rain and Natsu knew well that it was her witching hour. Flexing her talons, the fire dragon demon latched onto the old and crumbling wall of her den, using them to climb up and out.

Emerging in an alleyway Natsu sniffed around to be sure nothing was going to get the drop on her first before crawling fully into the darkness. She rumbled deep in her throat and felt the warm fire in her palm when she lit up her surroundings. Sniffing and nosing once more, Natsu rumbled a satisfactory approval at the lack of people around and spread her wings, the large deep-red velvety limbs that they were, and drove them down, flying up and into the night. Using her nose once again, then opening her mouth to let her sensory ducts in the roof of her mouth work better, Natsu identified three criminals that she learned of from her one-year streak.

Two-Face, Penguin, and… something else. Foul-smelling to be sure, though.

Natsu had decided to take the last one, since he smelled the most dangerous.

Veering towards the warehouse district, far out from the city she guarded, specifically where a lot of small groups went to hang out, the demon circled over the lit building like a Fury from Greek lore. Opening her mouth slightly Natsu detected that foul scent of madness, one the Joker specifically emitted- sour, muddy, toxic. Underlying that was another, one Natsu hadn't smelt before.

It was similar to the first but… dare she say it, sweeter and feminine.

With a smoky huff Natsu determined it was safe and dove, smashing through the ceiling and kicking up dust when she landed. A harsh cackling screeched from Natsu's left, making her tail lash in annoyance. "What have we here, Harley?!" a man dressed in a purple suit and green tie, sporting longish, greasy green hair and a snow-white face with blood-red lipstick swaggered forwards with a woman on his arm. Natsu bared her fangs and growled low in her chest, making the several footfalls meeting her tapered ears pause as guns cocked and aimed at her. The man pulled out a crowbar from who knew where while the Harley female pulled out a hammer; Natsu's mind went to static for a brief moment.

Hammerhammerhammerbonesbreakingtwelveayssixdaystwelvedayssixdays-!

With a hiss Natsu went with her instincts at the sight of that particular weapon, springing upwards and extending her talons at the nearest man in a clown mask. Buffeting him with flaps of her wings, she succeeded in carving bloody furrows in his chest.

The shot of a gun sounded and Natsu kicked off the first thug's chest to gain more altitude before firing a breath attack at the man who dared to shoot while dodging the bullet itself. More gunshots reverberated throughout the warehouse once the second man went down with a blood-curdling scream, and most if not all hit their mark. The noise alone wouldn't have been that bad for the demon to be distracted by, but the smell of more people coming, the cackling of the purple-dressed man, the screeching laugh of Harley-Lady. Natsu was going into an overload.

With a roar and fire sputtering from her fangs, blood trickling from the holes riddled in her body and agony making her knees wobble from her wings, Natsu fell back to the ground. With a pained wheeze and a moan, Natsu crashed into the gritty floor. She was still awake, snarling at the clowns and the head of the snake with his apparent mate.

The white face grinned at her before hauling back his crowbar and blowing a kiss at her, making her angry enough to spew smoke from her fanged mouth.

"Nighty-Night, little lizard. We're gonna have so much FUN!"

THWACK-! CLANG!

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~Seven Days later~

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"Jason, you need to stop this rebellious streak." Batman spoke over the com, calling his current protégé by his real name to drive home the firmness in his request. "I'm ready, Bruce! Fuck, if you just let me get out there on my own for a night or two I could show you-!" "This isn't up for debate! Dick never made a fuss about this, so you shouldn't either!" "I'm not Dick, Bruce! I'm so sorry I'm such a disappointment for you, but I'm going to prove to you I can do this! If not for you, then to show you that I'm not the ROBIN you so want me to be!"

Turning off his earpiece and shoving it into his belt pocket, the new Robin, AKA Jason Todd, paused on the roof of a building. Pulling out a hit-list book from one of his belt pockets he flipped through until he found the one he'd been tracking for a couple weeks before the trail went cold. The thugs call her Berserker, and the ones that were still conscious at pick-up babble about a demon wreathed in hellfire and claws of sharpened obsidian brimstone. She's got a face speckled in scales, demon wings, a long tail, and horns on her head. Her abilities include breathing fire, lighting her fists on fire, her feet, tail, wreathing her whole body in it. Then there's the flight, and clawed feet and hands.

She hasn't killed anyone, Robin mused. But fuck it- if she's dangerous and a SS wanted-for-questioning… thing…? then It'd be a good bet to go after her. After all, it's not Joker.

Little did Robin know he was going to discover that not all was as it seemed.

As he continued out to where the Berserker was last seen- an old warehouse outside but still within Gotham city limits, he started to feel uneasy. The air was warm, too warm for a spring night like this one. As he closed in on the warehouse the air began to heat up more before it cut out and dropped back to normal, leaving the Boy Wonder shivering slightly. Moving silently and watching for any guards that may be posted outside, Robin pulled himself up onto the roof and went around back.

A rooooohhhrnNnnnNNN…

A groan drew his attention as well as the undeniable sound of something (fabric maybe?) ripping. A shriek, long and agonizing echoed through the scattered junk outside the warehouse, pointing the now thoroughly freaked-out 15-year-old to the direction of a street lamp. One that was put up on the wall of the neighboring warehouse. When the boy peeked over the edge of the roof, going slow enough to make a seahorse proud, he froze at the sight.

Nailed to the wall by her vermilion, black and speckled gold wings, blood trickling down the red bricks and flames sputtering weakly from her mouth with every heaving breath, was Berserker. In front of her with her back facing Robin, grinning like the mad bitch she was, was Harlequin with a pair of garden sheets and pliers, quietly giggling and having at the crucified demon like a garden shrub in need of pruning.

The boy wonder was rooted to his spot, unprepared for the brutality he was faced with. The girl- for that's the gender Berserker was- was top-bare. Displayed on her bare chest was a picture-perfect Y-cut, meaning…

Berserker was an experiment before a year ago, when she began to make a name for herself. Robin wasn't stupid- proud, yeah. Reckless, check. Street-smart, definitely. But he knew that even if Berserker was technically wanted, she was doing what he and Batman did, just to a more drastic extent. Robin knew he had to help her, but how?

A metallic shnick and a shriek later Harlequin had grown bored. Pulling out a hammer and bashing at Berserker in the right arm a couple times and she walked off, rounding a corner and disappearing from sight.

Robin waited for a few beats to make sure no one was coming back before he turned on his communicator, mentally thanking the powers that be that he had thought well enough to not ditch the damn thing, and calling in the Bat.

"Jason, I swear to god-! Bruce is so freakin mad at you, man you have no-!" Nightwing started but Robin shushed him. "Nightwing, I'm gonna suck up my goddamn pride, pull my head outta my ass for once, and say I'm in over my head." "…Jason, what happened? What's wrong?" Robin- no Jason, wet his lips and looked at Berserker in her pitiful state: her wings were torn to hell and back, tattered strips fluttering in the breeze as she squirmed and moaned pathetically. Gashes and cuts all along her body bled sluggishly, her smashed-to-fuck-and-back right arm dangled at such a bad angle that Jason felt he would be sick.

"I decided to go after Berserker. She'd been missing for a week and she's wanted for questioning so I thought it'd be a good hit- prove to Bats I'm-… well I found her, Nightwing. She's-she's been brutalized, man." There was silence over the com. "Is she-?" "No, she's alive and conscious. She's bleeding from her arms, legs, head, and wings are like torn drapes, smashed-to-fuck-and-back right arm…" As Jason gave the status he found himself amazed that, as demonic and evil-looking as Berserker was and at how pathetic she looked now, she was still awake.

But then she didn't get much of a reprieve from the hell she's been getting.

"Robin, I've gotten Bruce and we're on our way now. Do you know if there's anyone else around? Like who could've done this to her?"

"Yeah, Harlequin. And if she's here then-." "Then the Joker can't be too far behind." Batman spoke, deep and gravely. Jason would die before he admitted that the voice of his mentor stayed the shivers of the horror at that moment. "Robin, keep near, don't take any unnecessary risks. The fact that you didn't let your anger at me and your pride get the best of you and called me spoke quite a bit tonight… I'm proud of you." Jason blinked before a small smirk wound it's way onto his face.

"Giving compliments, Bats? That ain't like-!"

Jason had turned his gaze away from Berserker while Bruce was speaking. When he looked back to check on her condition he froze, words dying in his throat.

Two mismatched eyes of red and gold looked right at him, hooded and glazed from pain but looking on him nonetheless and trying to focus to boot.

"Shit… Fuck me in the ass and back-!" "What, what is it?!" Nightwing's voice overrode Batman's. "She's looking right at me. She hasn't made any noise to alert Harlequin or Joker, but she looks defensive. I'm going down there. She needs to know I'm there to help and that she needs to stay calm. How long till you two show up?" "…an hour." Fuuuuuck… "Okay. I can hold down before then." "Stay safe, Jaybird. Good luck." "Robin out."

Taking a deep breath, Robin looked around to verify that no one was coming before dropping down in front of Berserker. Her tail twitched as she regarded the boy closely.

By now Berserker's mismatched eyes had managed to focus enough to let her hiss at him, smoke curling up from her nose and fanged mouth. "So you're Berserker?" Robin asked with a smirk. The girl blinked and then snarled at him weakly. "I take that as a yes, then." Robin muttered under his breath. The two stared at each other for quite a few seconds in silence, Berserker panting and shivering from the pain and Robin trying to come up with words of comfort. Robin opened his mouth to say something- anything to get rid of the silence- when Berserker's head jolted up, looking at the roof Robin had dropped down from. Her eyes were wide with rage and worry as she looked from the boy to over his head.

Before Robin could move a crushing blow was dealt to his left side, knocking him rolling down the grass and rocks. "OoooOh! Lookit what we have here!" Joker smiled so wide his face shouldn't have been able to contain it, swinging the crowbar around and tap-dancing over to the downed bird. "A little birdie outta the nest?"

Natsu growled as the man in purple as he approached the downed male. She flinched when the crowbar flashed into view, but her focus was on the boy who asked her if she was this Berserker. He was flipped onto his back now, groaning and struggling to get upright again. The purple man cackled and raised his crowbar high overhead and began to wail on the other. With every hit, Natsu began to shake. She saw her first friend and kill, Jackal, in place of the boy who came to save her.

Trembling in rage and fear and hate, the demon began to growl low and menacing in her chest. Smoke curled up from her lips followed by tongues of flame. Her tattered wings strained, sending lightning bolts of agony through her body but she refused to back down this time. Natsu huffed and grunted and roared with every strike to the boy- this male her age had come and it seemed like he was trying to save her. And he was going to die by this monster's metal bludgeoning tool.

Heedless to the top naked state she bore, Natsu let her rage stew and bubble.

Seven days.

She had been subjected to this mad creature for seven days, and now another would die from his insanity.

She had to protect the one who came to save her. Because that's what blood-debts were- he risked himself to save her. No amount of blood debts would satisfy the gratefulness coursing along with the hellfire in her veins. With a roar, Natsu's wings were freed, leaving two long strips of webbing from the nails stuck to the wall. With a deep inhale, Natsu squared her feet and brought up her flames. With a roar that shook the night, the Purple man was knocked away by the sheer blast of force from the voice she used alone. Stomping and lowering herself to all fours, Natsu ran to the unconscious boy and checked him, poking and nudging him tenderly and gently once she cooled her temperature. A groan from him had her sighing in relief. Looking over to the cackling Man in Purple, Natsu's eyes glowed red and gold, her flames surrounded her.

Joker was silenced when he looked at the pretty gecko he'd picked up a week ago. She stood poised over the little Birdie, her fangs borne and fire curling around her. Her tail snapped back and forth and her tattered wings gave her a creepy feel. Then the pretty gecko sprang, and Joker had enough time to think 'That's all folks' before searing pain clawed his chest and belly to hell and back. Waking up months later in Arkam, the Joker will have scars and a new enemy he might hate even worse than good ol' Bats