@Lugubrious Dude! I remember you from Horde of Evil! It's been a while.

<Snipped quote by Blackmist16>

Oh yeah geez, that was a crazy long time ago. How's things?

I hope this application suits you. Please let me know if anything I've done with the lore is dissonant with what you had in mind for the setting.

Hellfire Wildheart [+]

Wanna fight!?! [+]

Name: Sinmara
Age: 22
Gender: Female
Appearance: Standing tall at 5'11” and sturdily built, with a robust physique she's clearly proud of. She's got an earnest face garnished most often by a smile, with short, rounded eyebrows, slit orange eyes, pronounced teeth, and thick lashes. Curled horns sit atop a head of thick, curly hair, long enough to be tied in a massive bundle that reaches past her knees. Her favorite gear is a deep purple suit jacket, with an unusually large and showy collar, completely unbuttoned and with sleeves rolled up, kept in place by suspenders. A pair of matching pants complete the set, albeit with flame décor. A number of skull attachments adorn her outfit, including knee pads. Her fighting gloves are clearly labeled to avoid confusion, and a number of long scars dot her figure
Personality: Sinmara is possessed of a strikingly off-beat demeanor. Whatever damaged her memory did a permanent number on her psyche, leaving her a little crazed. She's unfamiliar and can have difficulty with a number of ordinary things, making her look like a ditz at times, but her most overwhelmingly notable trait is her love of fighting. Bordering on an addition to the high of battle, this adrenaline-seeking obsession makes her a force to be reckoned with on the battlefield, tearing through robots like it's the funnest thing in the world. She's just as happy to spar with fellow Sunderers however, with an unpowered blade, training weapons, hand to hand, you name it. She loves a challenge and to challenge, bordering on annoying at times. When she can't get her fix, she crashes, drifting off into daydreams about fighting or growing depressed and sluggish. It's almost impossible for her to concentrate on or deal with anything that doesn't interest her, and it is impossible for her to live a normal life.
Backstory: The underside of Fidelis has no shortage of sad stories, and what happened to a certain middle-aged nurse is no exception. After losing her beloved older daughter in an accident, she sank into despair, only for a stranger to approach her. He offered her the power to heal and comfort others, and she took to it wholeheartedly. That woman, Shubni, quickly rose to the status of a celebrated healer in Fidelis, using her blessings to numb the pain of those who sought her out. Her power turned out to be a miracle cure, and with the only side effect that her patients tended to sprout horns, many sought out her benevolence. She gained an almost cult-like following, her followers fervent but subtle in their adoration, displaying their horns with pride. Few hurt more, however, than Shubni's younger daughter, who'd been dulling her pain in her own way: though drink. Now seemingly forgotten by the only person who cared about her, the younger sister became a hopeless alcoholic. Eventually she too sought out Shubni's miracles, not really caring what happened one way or another.

What happened came as a surprise. Shubni's power hid a terrible secret: that its seemingly benevolent blessings helped people by warping their mental states, making their minds and even bodies more malleable. With authorities on her scent, Shubni decided to handle two birds with one stone, and pumped her forgotten daughter so full of power that her already-cracked mind went to pieces, scrambling her memories and personality. The daughter entered a berserk state, causing such a scene that the Sunderers were called in to deal with her. After a pitched battle the 'demon' was defeated and captured. When choosing what to do with the her once she cooled down to her present state, command decided to put her strength and desire to fight to use against the robots. Given the name Sinmara, the girl never recovered her old self, but took to her new assignment without complaint. In exchange for being cared for by the support staff, she's more than happy to fight whatever and wherever command tells her.
Powers: Stronger than tougher than the typical woman by a fair margin, Sinmara also boasts some hidden firepower. When she's excited, her movements and blows can superheat the surrounding air and struck surfaces, giving the appearance of flashing fire. She's pretty heat-resistant herself, but whether she cares if she hurts herself while fighting is another story. She's prone to entering a battle high when fighting that greatly decreases her stamina burn while boosting her pain tolerance.
Equipment: The hellfire chainspear, Burnout. A durable and deadly if not flawless weapon, its heats up to enhance its cutting power and burn through enemy mass. There's practically nothing better for exploiting openings for critical damage, but its faults become more apparent when leveraged against sheer armor. Its teeth can't cut through metal plating, instead relying on the heating function to melt through. The chainspear is powered by concentrated fuel, which can run out if overused or explode if subjected to enough damage.
Additional info: The character in Sinmara's backstory and her mother, Shubni, may factor into other backstories or world events if people like, perhaps as an explanation for demonic characteristics.

These various swords need not be carried on her person due to her special ability but are listed as the equipment she favours for combat and assassination respectively.