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.
Nightmare Fuel: Ratman's various more powerful forms (even just opening his mouth and revealing way too many sharp teeth) are not for the faint of heart. Rio has trouble sleeping after running into one of the tamer versions.
Unchain killing and eating a hideous chimera...complete with way more blood and gore (and a loose eyeball!) than the manga had ever shown. Just...Unchain's eating habits.