Yuyuko's rendition in this mainly because as a Big Boo, she's the cutest Boo ever.
That One Boss: Sakuya, who ironically is based on one of the easier Mario bosses, Super Mario World 2's Roger the Potted Ghost. The reason? Despite being a Chain Chomp, Sakuya still has her trademark knife-throwing and time-stopping abilities. Sometimes, knives that have already gone off-screen will come back at you when she freezes to redirect everything at you.