Trunks

Trunks is the son of Vegeta and Bulma, elder brother to Bulla and best friend of Goten and Gohan.

Search for the Black-Star Dragon Balls
Trunks goes with Goku and Pan to look for the black-star dragon balls. On Imecka, Trunks briefly battles with Ledgic, but he is defeated easily, who after which, Goku fights him. Trunks later encounters more powerful threats, The Para Brothers, General Rilldo. He is later briefly controlled by Baby, but is able to free himself from control, but not before Baby implants a mind-control seed.

Baby, The Evil Parasite
Trunks is taken over for good when Vegeta infects him. He later gives energy to Baby to become Super Baby Vegeta, and later Super Baby Vegeta 2.

Super 17, The Ultimate Android
Trunks battles Super 17, along with Goten, Vegeta, Gohan, and Majuub, though he is defeated and later Goku defeats him later on.

The Strongest Shadow Dragon
Trunks gives energy to Goku to battle Syn Shenron as a mightier being. He later battles with Omega Shenron with Vegeta, Goten, and Gohan. But his battle is futile, as Goku defeats Omega with the Universal Spirit Bomb later on