Considering I drew Bill Cipher smoking with a martini in hand, what do you think?
Further, I do believe things should remain "for kids" but it's fine to draw silly fanart as long as you're not directly showing it to children. Porn shouldn't be drawn of kids cartoons but whatever, the internet thinks that's some sort of "right" they have so there's no avoiding it now. I just wish they would keep it all on porn sites and not easily accessible but again, whatever.
I asked that because I assume the same people who whine about mature fanart of kid's shows such as Gravity Falls, MLP, etc. Didn't whine about the fact that Power Rangers and Transformers (both franchises made for kids) were rated PG-13 or Akibaranger and Kamen Rider Amazons were made for older audiences as opposed to kid's (which, unlike Akibaranger and Amazons, the official KR and Super Sentai were aimed at).