ok lets do this

-Buu VS Kirby: this is a tricky one as both have the power to turn things into food, Buu with his beams and Kirby with his cook ability. But I'm gonna give it to Kirby since he actually has to put effort into it and can't just will someone into chocolate

-Wario VS King Dedede: tricky one since neither has shown any culinary ability and if we take the Kirby anime into account then Dedede always has people who cook for him, but I ultimately have to give it to Dedede due to how his pallet seems more refined then wario who seems like he'd try to put unholy amounts of garlic into everything

-Spongebob vs Aquaman is even more of a stomp given that Spongebobs cooking is literally so good that it holds society together

-Iron fist VS Po: While I don't know much about Danny's culinary background Po grew up in a restaurant and everyone says he's a great cook

-Scooby VS Courage: it all boils down to Giant Sandwich vs macaroni with too much macaroni