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.
i feel like gary is a great example of this trope working relatively well bc he's such a profound little shit at first and then he eventually matures and stops being a dickhead
you know, like teens do sometimes.