reflects uv rays

“Is that hair natural? says Misaka as Misaka wants to know,” asked Last Order as they
neared a family restaurant chain.
“Eh?”

“Your hair! White hair isn’t normal, points out Misaka and stuff. And how do you
biologically even have red eyes, too? asks Misaka as Misaka is all confused.”
He should have ignored her, but if he did, she would probably start to get noisy again, so
he decided to give a noncommittal answer. He’d grab a late lunch, and then it didn’t
matter to him if he gave her to the researchers or if he left her on the side of the road.
Thinking of this as the last time, he was able to put up with the slight annoyance.
“This isn’t natural. It’s a side effect of my power or somethin’. I don’t know. The pigments
in your skin and hair and eyes protect your body from UV rays, but I always just reflect
all the extra shit anyway, so my body doesn’t need color. Somethin’ like that.”
Unexpectedly, he found himself feeling rather loquacious. He was always arguing
needlessly during the experiment too. Maybe he liked to talk more than he thought.
“Wow, that’s, like, kinda logical and stuff, says Misaka as Misaka is surprised. It’s like,
you’re Accelerator, so anything goes, says Misaka as Misaka gives up.”
“Why the hell you sayin’ you’re givin’ up? It’s just that my power’s too strong. My
hormones are out of balance or somethin’ because there’s barely any outside influence, so
now I’ve got this androgynous body.”

- Toaru Majutsu no Index Volume 5, Chapter 1 Part 6