Future Trunks

Future Trunks is the son of Vegeta and Bulma from an alternate future timeline where the Androids devastated humanity. Trained in desperate circumstances by Future Gohan, he became a Super Saiyan at a young age and eventually traveled back in time to warn the Z Fighters and deliver medicine to save Goku's life. He returned to his timeline after helping defeat the Androids and Cell, then later sought help again against the god-level threat of Goku Black and Future Zamasu, pushing himself to a Rage form in his most desperate battle.