The antagonists of Dragon Ball have fallen into a sameness. They may come in different forms and come from various places, but there's one thing they all have in common. They all have the same kinds of interactions with Goku and his friends. It's a near-endless cycle of unfamiliarity, condescension, surprise, and anger. In this sense, the fighters coming from beyond Earth work against them. They can't get to know the Z-Fighters without battling them, so all their reactions are variations of one another's.
Source：https://www.cbr.com/dbz-androids-best-villain-hero-dynamic/
