kitty and mimmy's playground onion

"Kitty and Mimmy" refers to the popular characters from the Sanrio family, specifically from the "Hello Kitty" franchise. The term "playground onion" does not seem to have a specific meaning or association with Kitty and Mimmy. It may be a playful or creative idea, perhaps something like a themed playground for kids inspired by these characters. If you'd like more specific information regarding Kitty and Mimmy or a certain concept involving a "playground" and "onion," please provide a bit more context, and I’d be happy to help!