>everyone has a schizo theory
Here's mine. Maddie will be the superboss of a later chapter. She'll end up in the dark world and meet the Mew Mew doll, who is now a darkner. Throughout the chapter, they form a friendship and will eventually fuse. When you find them and unlock the fight, it will play out as a full episode of Mew Mew Kissy Cutie. You'll have to use the split heart mechanic to play out the correct scenes in the episode.