I'll say Fate/hollow ataraxia? Or Kagetsu Tohya. That's overall, as "games that are H" and not the H in and of itself. I'll save the more maniac answers to this question for an Adult Chat thread.
It's not very unique, but probably either the Monster Girl Quest visual novels or "Dragon Pink: The Zero Castle," which I would definitely love a translation of.
On the slightly stranger side, I also like "Seraphita" (PC-98 and Windows 9x). Was really hard to track down the windows version, though, and it's probably never getting a translation (I think Dragon Pink has a 1000% better chance at least). A slightly odd thing about Seraphita (apart from the dickgirls) is that it has red book CD audio, which is neat. I mean, I know a lot of games did at the time, but it was still amusing to realize I actually had a use for my old Pentium laptop with its parallel port CD drive.
This post has been edited by dragontamer8740: Dec 11 2019, 14:36