Mystogan

Mystogan (未来のトランクス, Mistogon) is the Saiyan and Earthling hybrid son of Vegeta and Bulma from an alternate world. By the time Trunks was born, the timeline had been altered by Mystogan' and Cell's trips to the past. Therefore, the two Trunks (Mystogan) had completely different lives (as opposed to those who lived before the Time Machines arrived, they lived exactly the same lives as their counterparts until the point at which the two timelines diverge: three years before the androids arrived).

Hell Gates Saga
Mystogan fights villains that escaped Hell. He easily killes Hell Fighter 17 and Dr. Gero but is defeated by Demigra.

Universe Survival Saga
Mystogan gets killed by Hit/Frieza so he can't participate in the Tournament of Might. He gets wished back by the Namekian Dragon Balls and tries to get his revenge. He is stopped by Grell who saw how much job he is going to have if Mystogan got to Hit/Frieza and stabs him with his chainsaw killing him again.

Conspiracy and Survival Saga
He is resurrected again to fight Saiko with other Z Fighters and forgives Grell and Hit/Frieza. He attacks Saiko only to be defeated once again and is saved by Vegeta. Later, he lets Gohan to absorb him in order to defeat Saiko. Then he gets saved from the erasure by Zen-oh as Wolfy writes him off.