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.
Nero himself. Since he intentionally started the Great Fire of Rome, and ordered Ben crucified. In his Villain Song, he exactly stated that Rome could continue burning, and that he would never cease fiddling.
Fridge Horror – Nihilus takes Ben away at one point, palming a whip and stating that before Ben knows Nero’s wrath, “you’ll know mine.” Ben visibly flinches at the implication. The fridge horror kicks in when you consider the fact that the ancient Romans made torture an art, and as Ben is both a resident alien (not a citizen) and an ethnic minority, he’s little more than battering practice for the Romans.
Fridge Logic – Typically, a male lion’s first act as a new pride leader is to kill any existing cubs, as a means of driving the lionesses into estrus. But Mangler seems perfectly content with Leo and Theo. Supposedly because he’s been missing his pride, and this new lioness and her cubs make up for the loss.