So Accelerator is able to fine tune his shield against light (UV and hair pigment comment)

He also gets himself a loli, that is as annoying as Index.

He's easy to play with, that scientist easilly had him choose the loli option.

I also think he could enter the faction and he's a nice combo with Touma, provided he can overcome the fact he's been beaten by Touma of course.

The fact he was beaten by Touma, has every dumbasses think they can do the same.
Thing is they think wrong in only seeing Touma as powerless. So they get beaten by their own idiocy.
Problem is that there are lots of them that keep coming, so it's a bit annoying over time.

I'm starting to think he may also have lots of minor bad luck happenings like Touma.
Why? maybe because he reflects good luck as it tries to enter his life...