Tien has three eye's on his head but is still considered an Earthling because that's where he was raised. His best friend is Chou Zu. He is a pretty good fighter, he's a little stronger than Yamcha. In Dragonball he was Goku's enemy and was even more powerful than him, but Goku eventually beat him after Tien used up his energy fighting Piccolo Diamaou. He appears in DB and DBZ but isn't in DBGT.