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.
not defending being the seat of power in a fascist warrior society, but uh, he was raised in a tank without parenting on a fascist warrior planet, did you expect him to be a good dad?
No, but I also don't expect him to be welcomed by the heroes with open arms and be treated with kid gloves for the rest of the series.