Future Trunks is one of the unlockable characters in the Episodic Battle mode in Dragon Ball Sparking Zero. Out of the three, he also has perhaps the most cryptic completion method to get all his side paths.
The good news is that all of Future Trunks’s branching paths in Dragon Ball Sparking Zero are linked to his side paths and are relatively linear once you start them. As a result, there’s no real need to complete missions that aren’t a part of the unlockable paths. Much like Vegeta’s branching paths, Trunks’ side paths all present him with the opportunity to surpass his father and Goku’s power levels, so here are all the methods for unlocking Future Trunk’s side paths.