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.
Ass Pull: Lampshaded with the "Ultimate-Teamwork-Attack-pulled-out-of-our-asses" against Eggman.
Nightmare Fuel: In of course, Nightmare!?, we have: Meltigemini from the Kashiwagi twins' forced melding, Lirael unveiling herself as Legion, Kurusu stabbing herself to get rid of the darkness, Akira's death, etc.