Well, I love yandere, yangire, menhera, 闇, 重, etc etc characters.

basically, extreme emotions, instability, crazy, yes please. SO I always welcome more of such content.~ Although a lot of stuff is still only within the Japanese sphere which is a big reason I started learning Japanese.
My onlyyyyy issues are like, people that use the tag far too loosely. (like okay, characters that are just kinda jealous and possessive can be nice too but that doesn't make them yandere... and sociopath's can be interesting, but they need the dere for that..~) oh.. and the general issue of minors in adult spaces these days, I backed off from a lot of social areas with yandere interests due to the large amount of children... like.. no.... I'm in my 30's, that's incredibly irritating and uncomfortable as hell lol. (like a girl boasting about her "rl yandere bf" like no gtfo with that roleplay/go to an adult if you're being taken advantage of)
and I do believe in general, heavy/dark/questionable content should be treated carefully for those not mature enough to understand the difference between fiction and reality, not just for the pornographic areas... (and yes, I always consumed a lot of heavy fiction growing up myself but I didn't just go into adult spaces being loud and comfortable, I may have quietly consumed lol)