• Undertale AUs
• Mashup tourneys
• Politics, mostly (I just don't find them fun to talk about, and I particularly get annoyed with conservative politics. DNI with me or anyone I know if you are legitimately discriminatory)
• Religion (I personally don't like talking about it but I try to be respectful of others. You believe whatever you want, as long as you aren't actively oppressing others I don't really care too much. I'm personally agnostic.)

I know this list is short and oddly specific in places, but that's because all of these, for the most part, involve bad personal experiences directly in or adjacent to communities surrounding these.