Name: Ally Stein
Alias: Agent
Age: 16
Gender: Female
History: To be revealed later on.  Just kidding. XD Well, I'm not 100% sure yet, but I'm thinking her parents were both scientists and were always experimenting with animals, mainly mice since they weren't cruel.  Then they had a daughter and decided a kid could handle experiments better than an adult, so they exposed their daughter, Ally, to the chemicals.  Well, it wasn't bad as she gained powers from this.  Then they noticed she got very sick and weak whenever she was reexposed to the chemical.  They figured she would want to join the Justice League once she got older since the young girl always followed their stories, so they got her into some fighting classes.  Other than that, I don't have much. XD
Powers or Abilities: I'm thinking some super strength and speed.  As far as the strength goes, she can lift a car, but more than that is too much.  Maybe she can train it, but I haven't decided.  Her super speed isn't like Flash, it's more like she can do a mile in a couple minutes, which is still really fast.  Other than that she does know Muay Thai (basically kickboxing) and Brazilian Jiu-Jitsu.  When she's out doing vigilante stuff, she has several things you can get from a firework stands.  She has those strobe flashing candles and smoke bombs.  Maybe a grappling hook, I'm not sure.  I would guess super strength would let her jump kind of high.  Well, not higher than a building, but fairly high. XD  She technically has some access to her parents' labs and tech, but she doesn't take advantage.
Looks: 
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[img]http://img04.deviantart.net/0e13/i/2013/320/1/f/ally_seiti_by_1yoyo93-d6uh983.jpg[/img]
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If things look too OP or need more explanation, please let me know, I kind of did this really quick.