Sai is a traditional weapon. Dagger shaped blackjack-weapon, with two curved prongs projecting from the handle...
Sai could also mean a spy sent by stupid Danzo to look over for team Kakashi's action particularly on Naruto cos he's interested in Kyuubi's power, duh what a lousy old man. But I think Sai had a change of heart already since the guys taught him emotions he haven't felt before, so weird. He's got this seal on his tongue so he could not talk about Danzo thus keeping all his plans secret, oh yeah all of his minions have seals too creepy.
Sai's real name is unknown (Sai is just a code name). Beeing a member of Root, he might not have a name.
well, naruto shippuden episode 1 has sai in it, but only because it is a preplay of the future. the first time that naruto actually first meets sai is naruto shippuden episode 33 or 34.
we never knew his name
Its when naruto, sakura, and sai go on their first mission.
sai is a foundation member who works for danzo currently sai is in team kakashi, and sai did not try to kill naruto he was testing his strength according to sai
http://naruto.wikia.com/wiki/Sai
Sai is no match for naruto because naruto has resagan and he has the nine-tailed fox in him. naruto can make multi clones and that takes a lot of work. naruto can turn himself into Sai by using his clone justu. So Naruto is way stronger then SAI . Sai thinks hes better than naruto but he is weak
No.
Sai holds it in his pocket.
In part 1; Sasuke, in part 2; Sai
Sai doesn't have a last name. sai is just a code name like captain yamato because they are both anbu and they have to keep their idenities a secret
http://naruto.wikia.com/wiki/Sai
Sai does not wear glasses.