Hentai: (
Objectionable Content) (
↗hentai (
変態) = "abnormality; pervert;") All pornographic anime falls into this category. Hentai titles all have strong sexual content (which may or may not have a censorship mask depending on if an uncensored version was released) but they can have surprisingly good stories (
Gosenzo San-E), be very funny (
Spaceship Agga Ruter), be cute (
Elf no Waka Okusama), or a combination. Of course, they can be sick as well and there are tons of those titles out there.
(Side note: "Hentai" is an exclusive Western term. All "hentai" games and videos are called ↗Ero (Erotic) nowadays, and erotic games would be called "Ero-Sim" instead of "Hentai-Game".) See also:
↗Wikipedia:Hentai.
Magic: (
Story/Location) Titles which don't fall into the "
Fantasy" category but still feature magic.
