Son Goten is Goku's second son. Goten suprised Gohan and Vegeta by
turning into a Super Saiyan at a very young age. 

Goten and Chibi Trunks can
fuse to become Gotenks. 

Chibi Trunks is Goten's best friend.

Goten trains with Gohan often.

 He likes to fight alot, like Goku. He entered the Tenkaichi Bodukai, and won second place at the tournament. Goten has a lot of potenial like his brother, Gohan. 

Goten is a very strong character in Dragonball Z.