These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
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.