[list][*][u][b]Name:[/b][/u] Shirai Kuroko
[*][u][b]Universe:[/b][/u] Toaru Kagaku no Railgun/Toaru Majutsu no Index
[*][u][b]Appearance:[/b][/u] [url=http://safebooru.org//images/975/c0f1b0a04ac895b1aa94f0ef864ccec7ff306844.png?980798]Not pictured: she's kind of short.[/url]
[*][u][b]Personality:[/b][/u] There are two sides to Shirai Kuroko--which fits the black-and-white theme of her name. On the one hand you have a somewhat blunt young woman, who despite the amazing abilities and science she's exposed to on a daily basis is quite sceptical of anything that could exist beyond the realm of Academy City's futuristic science. She's a bit too formal, but generally quite a relaxed person--with a sense of justice strong enough that the concept of backing down seems to elude her. And, unlike her roommate, she actually joined Judgement so she could help [i]legally[/i], which she takes extremely seriously.
Then there's the other side, which can be best summed up as an alarming degree of attraction towards Mikoto and a tendency towards impulsive action. Whilst her attention in that regard certainly seems to not be desired--especially when she gets too touchy--it's nonetheless a very genuine attraction, and she's willing to do whatever she can to make sure that the Railgun is actually happy... no matter how much danger this might put [i]her[/i] in.
[*][u][b]Powers/Skills:[/b][/u] Kuroko is a Level 4 esper with the most wonderfully descriptive ability name in the series: Teleport. It does exactly what it sounds like and allows her to teleport things: specifically, herself or anything that she's in contact with. This has its own limitations--around 130kg weight and a range of just over 80 metres. Because the basis of her ability is doing maths in eleven dimensions, if she can't concentrate, then she's not going to be teleporting anything--but she's surprisingly resilient to pain for someone of her age. 
Quite oddly for a high level esper, Kuroko isn't completely reliant on her ability in a fight--teleporting is useful for pinning people down by their clothing or getting around them, certainly, but a brawl isn't always the place for doing maths. Instead, she actually seems to know martial arts, presumably something close to aikido--not only is she young, she's small and not particularly bulky, and her fighting style is all about using people's strength against them. Except, of course, with the common inclusion of surprise dropkicks.
[*][u][b]Brief Bio:[/b][/u] After joining Judgement the year before enrolling in Tokiwadai and getting a much needed growth spurt, Kuroko was involved in preventing a bank robbery, which was pretty much the most exciting thing to happen until after she met Misaka Mikoto... and somehow managed to end up as the older girl's roommate. Since then, she's been involved in several rather more serious incidents--though she doesn't know about the worst of them aside from said roommate coming home late a lot--and gotten rather hurt once.
[*][u][b]Equipment:[/b][/u] Aside from her phone, Kuroko has the two belts of needles strapped to her thighs, useful for pinning people down by their clothing or disabling complex mechanisms. It's a shame that she doesn't have the much larger belts handy. 
[*][u][b]Others:[/b][/u] [/list]