La Pucelle seems really cool, Disgaea is one my favorite JRPGs ever. I'd also rec Sting as another similar JRPG developer, though "similar" is kind of a stretch since they're easily one of the most unique studios of that period, I mostly just say that because I like their character designs a lot wwwww
I haven't watched too much old anime, mostly action stuff like Oedo 808 or Gunsmith Cats, but I'm fond of BL. I can't call Yarichin my favorite because I kind of hate how whorish the boys are, but Yacchan is one of my favorite characters from any manga ever.
Vampires I generally associate with cool evil gun manga, Hellsing and the like. I'm kind of half-heartedly working a game involving an angel protagonist.
I've been playing a couple Dreamcast Shmups on emulator, Border Down and Kaorus specifically. I'm actually terrible at shmups (Th7 is my fave 2hu because it's the only one easy enough that I've 1CC'd on normal) haven't beat stage 3 of either yet but I mostly play them for the musical experience so I'm fine with that. VNs I find frustrating because I live in a noisy house and can rarely find a comfortable time to actually focus on one, still I've been reading through The Silver Case recently.
I only really know Malice Mizer as far as Vkei, I like Hikari Light Club though which I kind of consider aesthetically adjacent.
I've never used xmpp before, but I guess I might as well leave mine here too: ghost-ogre@xmpp.jp