Name: Speed Demon (Marzia "Mazie" Bianchi).

Is your identity public or secret?: Secret, sort of - her Earth-civilian identity is actually relatively new. She hasn't told anyone on this plane her real name.

Age: 19.

Gender/sexuality: Female/homosexual.

Appearance (general): If it wasn't for the demon-looking parts, Marzia would just appear to be a slight young woman with unusually light coloration. She's fairly pale, with very long hair that's also very white despite her youth, and five feet tall with a slender, athletic build. Her features, which mostly mirror those of actual humans, are delicate and pretty. However, she also has bright yellow eyes with horizontally-slitted pupils, curved black horns at the side of her head, and a thin, flexible, goatlike black tail.

Costume: In her original appearances on Earth, Mazie didn't wear a costume at all, but now that she's turned to heroism she's tapped into her love of Westerns. She now wears an armored black duster into battle, along with a black cowboy hat tucked between her horns and boots to match.

Personality: Mazie has the sort of gung-ho, carefree approach to life that goes along with functional immortality. She recognizes not everyone (in fact hardly anyone) shares that talent though, and takes care not to endanger others. She also recognizes that there are situations that don't have a simple reset button, such as her relationships with others, and sometimes swings all the way into overcaution there instead. She can come off as standoffish or shy around people she likes as a result, at least until she feels comfortable enough with them to let her hair down.

While Mazie used to be a villain, she doesn't come off as regretful at all. It came about first due to compulsion and then to ignorance, so she doesn't beat herself up about it.

Interests/hobbies/likes/dislikes/pet peeves: Mazie loves anything fast. Especially and in no particular order: fast music, fast cars, and guns. She's learned how to dance and play guitar due to the first, how to drive for the second, and how to take care of machines for the last two. Not being able to legally own firearms at her age doesn't seem to have deterred her any, maybe because she finds legal technicalities obnoxious and tends to exempt herself from them even as a hero. At least these days, she only lifts guns and ammo from stores, and makes sure to leave the appropriate payment behind. Speed limits are still her eternal nemesis, though.

Mazie dislikes anything that makes her feel uncoordinated or dull, so she's pretty straight-edge for a former homeless criminal. No alcohol or drugs for her, though she doesn't judge others for using such things unless they get annoying about it. She also gets bored quickly and can easily be mistaken for having a short attention span, but the reality is that her swift perception and racing thoughts make everything feel drawn out compared to human norms. She's mostly adjusted to the slower human lifestyle, but her hobbies tend to revolve around things she can enjoy at her own pace.

Background: Mazie hails from a race of creatures - properly identified as extraplanar humanoids, though sometimes referred to as "demons" due to confusion with unrelated creatures - that were long ago summoned in magical rituals to serve as hunters and killers of the foes of human mages. The methods to do so faded into antiquity, only to recently resurface due to an archaeological discovery in Italy. The magical scrolls fell into the wrong hands, and modern-day villainous mages tried these long-lost summonings. The result was... underwhelming.

The civilization of the Hunter-Killers, as they were loosely known on Earth, hadn't advanced at nearly the same speed as those of the humans on Earth. Furthermore, the lack of skill of the summoners meant they grabbed one lacking in magical strength of her own, namely a teenage girl. She had mildly superhuman prowess, but when she was sent against a local politician to serve as an untraceable assassin, she just got a couple of good punches in before being gunned down by his bodyguards.

She was summoned several more times, to similar results. At her age and level of training, she couldn't stop a bullet, or outrun a speeding car. What she could do was come back every time, as her body was being "reincarnated" with each summoning; her real life-force was safely back at home, just suspended to remotely inhabit a form on Earth. Eventually the villainous mages realized Mazie (as she later came to be known) needed some firepower and training of her own, but right after she got this upgrade, a rival gang firebombed the headquarters she was in, wrecking her magical supports just before she perished yet again.

This time, though, it was the going home part that didn't work right, and Mazie's life force simply bounced off the planar walls of Earth's dimension and returned in a new body a short while later. Now Mazie was at once free and stuck, with no family or friends, and no understanding of Earth's culture, but also considerable curiosity about some of the local toys.

She briefly became known as the minor teen villain "Joyride," for her habit of stealing and crashing cars, before the hero Ghost Bat intervened. He'd figured out that there was more going on than met the eye with this strange-looking hoodlum in Italy, and sought her out. Mazie was lost and chaotic by nature, but not genuinely mean-spirited, and once he took the time to help her understand things like property rights and public safety she was happy to accept the offer to start over with a new identity in America. She finished out her adolescence getting caught up in high school (wearing heavy clothes and hair dye), then was soon scouted by the totally-unrelated-to-Ghost-Bat Wayne Bruce.

Powers/abilities (general):
-Planar Immortality: Mazie's "self" can't be killed by normal means. Certainly she takes damage as normal, but if she dies - even as a matter of self-applied willpower - her body simply vanishes in a puff of magical dark fire, then reappears elsewhere a little while later. She doesn't control where she shows back up, though it's usually fairly close by and always on a solid surface, i.e. not in the middle of the Earth or up in the sky to fall right back to another death.

Mazie can be genuinely harmed if someone seeks her out on her home plane, where she's essentially in suspended animation due to her life force being separated from her real body. They'd have to tangle with her family and community in that case, though.

-Hunter-Killer: Mazie belongs to a species build for endurance hunting, and while she's no Superman or Flash, in a straight fight she's more than a match for any regular human. She's strong and tough for her size and superhumanly fast, especially in perception and coordination - a great combination in a brawl but even more effective when she's using a firearm, her preferred method of combat. She uses rubber bullets unless she's fighting monsters or something, though. Also, "superhumanly fast" is relative - she can out-draw just about anybody, but if someone else does get the jump on her, she can't just shift into hypertime and step out of the way of the bullet like it's standing still, like some speedsters are capable of.

Being a Hunter-Killer also means having good senses for tracking, but that's another area where "superhuman" doesn't mean, say, atomic-level vision or knowing what the moon smells like. It does mean she doesn't need scopes on her guns, so that's handy.

Other: Mazie's accent is faint but distinctive, as she first learned an extremely rapid extraplanar language and then Italian before eventually ending up in Texas for high school.