Tensei shitara Slime Datta Ken
Typical "isekai". I regret trying it.
Tatakau Shisho: The Book of Bantorra
Tangled supernatural mystery with a bit of action combat. Personally, I didn't like it, but others may.
Tasogare Otome x Amnesia
Decent romance for a school setting with supernatural mystery.
Gilgamesh
Very strange. Incredibly niche. I cannot recommend it outright.
Bounen no Xamdou
Beautiful and romantic show. Deserves more recognition.
Speed Grapher
Heavy story with odd superpower themes. Difficult sell.
Maoujou de Oyasumi
Cute and lighthearted comedy.
Tobira wo Akete
Tobira wo Akete is neither forgotten classic nor a diamond in the rough. Feel free to skip it.
Nozomanu Fushi no Boukensha
Slightly above average fantasy. Uses game-y logic. Thankfully not an "isekai".
Detroit Metal City
Underappreciated comedy.
Outbreak Company
Lighthearted fantasy comedy.
Mnemosyne: Mnemosyne no Musume-tachi
Sexual tension given form.
Ima, Soko ni Iru Boku
Reasonably effective metaphor for war.
Blood-C
Slasher show with a tinge of schizophrenia.
Gokukoku no Brynhildr
Strangely it's both derivative and unique. For those who like dark stories.
11eyes
Generic dark urban fantasy.
Hitsugi no Chaika
Romantic fantasy adventure and action.
Dungeon Meshi
Simple and effective fantasy adventure.
Juuni Taisen
Sloppy action with no substance.
Hai to Gensou no Grimgar
Mild and slow generic fantasy with slight emphasis on mortality.