The easiest place to start is definitely 'The Misfit of Demon King Academy'. Anos Voldigoad isn't just powerful; he rewrites reality from episode one. The whole premise is him being so ridiculously strong that the world's entire magical system can't even recognize him properly, which I find hilarious. It's a power fantasy that leans into the comedy of being utterly unstoppable.
For a slightly different flavor, 'Saga of Tanya the Evil' comes to mind, though the overpowered element is more strategic and ruthless than raw magical blast power. She's a salaryman reincarnated into a magical WWI-esque conflict, and her tactical genius backed by being the favored 'apostle' of a god-like being makes her nearly unbeatable in her theater of war. It's less about flashy moves and more about cold, calculated dominance, which can be just as satisfying.
'Cautious Hero' is worth a mention too, but the overpoweredness comes with a massive, obsessive caveat that's the whole joke. It kind of deconstructs the trope while still delivering on the spectacle.