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.
Hazel and Cha-Cha are especially monstrous. When a cook jokes that he wouldn't give up the recipe for his apple pie "even if you cut my arms and legs off," they oblige. For shits and giggles. Then they just get annoyed when he finally tells them the recipe because they've already forgotten why they cut the poor guy up in the first place, they were enjoying the dismemberment too much.
Dr. Terminal is no slouch either. He could apparently consume any matter to keep his disease in remission, but seemed to like the taste of human beings more than anything.
The Academy's founder, Sir Reginald Hargreeves. He snatched up seven babies who could have been taken in by normal people and led healthy lives. Instead, they're stuck growing up with a man who allows them little-to-no personal freedom so he can risk their lives for his own boasting, verbally abusing them in between.