I'll do Hinata's next if I can think of some for her :D;;; And it's eight facts 'cause I'm lazy right now.
His father let him try to light fireworks when he was nine. Consequently, Deidara nearly blew up their cat.
He's claysexual. (maybe not so factual here...)
He has a very strong immune system.
He started growing his hair out in grade four, imitating a girl he then had a crush on- and even when he lost the crush, the hair style just kind of stuck.
He's had many near misses with explosions before; he's been treated for burns multiple times.
He'd never tell anyone, but he spends a lot of time on his hair- probably more than some girls do.
Therefore, he gets very offended when someone insults it.
Deidara enjoys bird-watching, but it's one of the hobbies he has that he does less than others.