Future Gohan, now an adult, is shown being far more serious and aggressive than his present timeline counterpart.  Future Gohan seemed to have lost his pacifist-like demeanor which he had.


Trunks, having never met his father, nor grown up under his influence, combined with the fact that he grew up in an apocalyptic world, is very cautious, broody, and serious (such as when he begged Vegeta not to challenge the Androids without Goku being present or when he did not want Vegeta to trust Paragus)