Waluigi in the Mario games.
It's not that he's annoying or bad; he's just pointless is all. I understand why Wario exists since he's Mario's rival, AND has games. But Waluigi's only purpose is to be the anti-Luigi that serves as Wario's sidekick that does virtually nothing. Luigi at least does crap like jump high and goes faster, while Waluigi just takes up room.
If Nintendo made a Waluigi game, then fine keep him there. But if not, he just takes up space.