Is the Sai that you are asking is from naruto shipuuden? If yes, he is really not bad, he's one of the good guys on the anime.
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Karana uses sai sai as a light source.
Sai is not a bad guy he just do what his master or leader order him. and besides he had no choice but doing that coz Danzo put a seal on his Tongue so e could never speak something that Danzo told him or telling secrets .
Sai On died in 1761.
Sai's brother is Sora cause on sai's book the cover has a boy that looks like sora
It is a small fish that you can burn and it burns brightly.