The rival.
Especially the douchebag Machiavellian type rivals that the main character ends up friends or teaming up with after the main character 'proves their worth' to them by being stronger. No character growth outside of now they work with the protagonist.
I really want this trope to be subverted one day, like the douchey rival shows up and everyone is just like "Wow what a dickhead" and just relentlessly bullies him until he goes away.
vegeta was forced to team up with goku and the bois to fight frieza on namek and after he died and was wished back along with all the nemekians, then he just kind of moves in with bulma I think??