Probably Pokemon and Okami. Okami is artistically brilliant but it's rather childish in the gameplay. Peeing on opponents and the like...but it's so much fun and so brilliant in it's own way that it doesn't bother me.
Well I guess it's a case of interpretation But Okami is "childish" in a very good way like I said. I love to be able to just run around, paint things, chew thing, bark and all that stuff with excessive sex and violence and blood, It's an awesome game.