Future Trunks

Future Trunks grows up in a world where nearly every powerful fighter on Earth has been killed by Androids 17 and 18. His father Vegeta was among the first to fall, and the remaining warriors were picked off one by one. The only fighter left to train him was Future Gohan, who became both his mentor and his closest friend. When Gohan is killed in battle against the androids, the grief and rage push Trunks to unlock his Super Saiyan transformation for the first time.

With no hope of defeating the androids in his own time, Trunks's mother Bulma devises a plan: she constructs a time machine capable of sending him back to the past, where he can deliver a cure for the heart virus that will kill Goku and warn the Z Fighters about the android threat. Trunks arrives in the past and makes an unforgettable entrance, effortlessly slicing Frieza and King Cold to pieces with his sword before any of the Z Fighters can intervene.

His time in the past serves a dual purpose. While he provides vital information and fights alongside the Z Fighters during the Android and Cell sagas, he also gets to know his father Vegeta for the first time. Their relationship is strained; Vegeta initially shows little interest in his future son, prioritizing his own pride and training above all else. Despite this, Trunks remains respectful and hopeful, slowly earning Vegeta's grudging acknowledgment through his courage in battle.

During the Cell Saga, Future Trunks trains in the Hyperbolic Time Chamber alongside Vegeta and achieves a form beyond the standard Super Saiyan: the Super Saiyan Second Grade, a bulked-up state that dramatically increases raw power. However, he quickly learns a hard lesson when Cell points out that the form's increased muscle mass sacrifices speed, making it impractical in a real fight. This realization mirrors the broader theme of the arc, where brute strength alone cannot guarantee victory.

After Cell is defeated by Gohan, Trunks returns to his own timeline armed with the strength and experience gained during his time in the past. He destroys the future versions of Android 17 and Android 18 with ease, then hunts down and eliminates the future version of Cell before the bio-android can steal his time machine. With the threats removed, Trunks brings peace to his devastated world and begins the process of rebuilding.

His departure is bittersweet. The bonds he formed with the past timeline's Z Fighters, particularly his father and Gohan, cannot carry over to his own world where those people are gone. Trunks returns to a future that is safe but lonely, carrying the memories of a family he can never truly have.

Future Trunks returns in Dragon Ball Super when a new threat emerges in his timeline: Goku Black, a mysterious fighter wearing Goku's face who systematically exterminates humanity. Alongside Future Mai, the leader of Earth's surviving resistance, Trunks fights a desperate guerrilla war against Black until he is forced to retreat to the past for help once again.

In the past, Trunks trains alongside Goku and Vegeta and confronts the truth behind Goku Black's identity: he is actually Zamasu, a rogue Supreme Kai apprentice who used the Super Dragon Balls to steal Goku's body. The arc escalates dramatically as Zamasu and his future counterpart fuse into an immortal being that threatens to consume reality itself. Trunks responds by channeling the energy and hope of every surviving human into a massive Spirit Sword, a blade of pure ki that cleaves the fused deity in two.

Despite this victory, Zamasu's essence spreads across the sky of the future timeline like a plague, forcing Zeno to erase the entire timeline from existence. Trunks and Mai survive only because Whis creates a branching timeline where they can live. This outcome is both a triumph and a tragedy: Trunks saves reality, but loses his world forever. His story arc in Super reinforces the themes of sacrifice, resilience, and the cost of being a hero in a universe where the stakes are always total.