If you liked
Senya Ichiya Monogatari
|
...then you might like
Lupin the Third: Mine Fujiko to Iu Onna
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Both have a similar art style and heavy sexual overtones. Both also have a bizarre story.
If you liked
Suika
|
...then you might like
Yosuga no Sora
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Both combine great "action" with great romance. Also grey haired lolis.
If you liked
Perfect Blue
|
...then you might like
Higurashi no Naku Koro ni
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Similar eeriness and bloodiness. Oh, and mind fuck.
If you liked
Perfect Blue
|
...then you might like
Oretachi ni Tsubasa wa Nai: Under the Innocent Sky.
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Would be spoilers to say the main reason why but both are loaded with mind fuck and have some very nice fan service.
If you liked
Koi Kaze
|
...then you might like
Usagi Drop
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Both deal with the relationship between an older than usual male lead and much younger female relative.
If you liked
Ginga Tetsudou 999 (Movie)
|
...then you might like
Wanpaku Ouji no Orochi Taiji
|
Both are family-friendy coming-of-age stories about a young boy who loses his mother early on and goes on an epic journey through a variety of locations. Both have great main characters as well. Wanpaku Ouji is older but has smooth animation, an amazing sound mix, and some great action. GE999 is more story and character driven with some philosophizing.
If you liked
Hikaru no Go
|
...then you might like
Yu☆Gi☆Oh! Duel Monsters
|
Both share very similar themes of maturing through games, friendship, and earning respect. If you liked one you'll probably like the other for the same reasons, though Yu-Gi-Oh is easier to get into and more epic.