Tien

Origin

One of the few humans to ever master his Ki and perhaps the strongest human ever to exist. Tien trained under Crane Hermit when he was young. Tien trained hard until he became an incredibly powerful warrior not to be reckoned with by any on Earth. His past is never fully revealed, but through the course of several adventures he becomes best friends with Chiaotzu. 
 
He faces off against Goku in the finals of the 22nd Tenkaichi Budoukai, Tien wins but only but only barely and sort of by luck. Tien stays loyally by the side of Chiaotzu, his travel companion and sparring partner, and his closest friend.  
 
Tien and Chiaotzu lost their lives in battle against the Saiyan Nappa. Along with Yamcha, they were sent to train under King Kai on his planet. This increased Tien's strength and ability greatly. They were eventually wished back to life with the dragon balls.
 
Tien has many moves that the other Z-Fighters picked up from him and used in battle. Some examples of these are Solar Flare and the Tri-Form technique. However, unlike the others, Tien masters the Tri-Form technique and expands on it until he creates multiple forms of himself, sometimes 4 or more. He also masters a move called the Tri Beam, the same used to stall Imperfect Cell, an act that nearly kills Tien.