If you liked
Blood+
|
...then you might like
Ryuu wa Tasogare no Yume wo Miru
|
They both share a similar storyline: They feature a somehow ancient species which is attacking humankind, as well as a protagonist who is one of those monsters, but tries to get along with humans. Furthermore, in both manga the normal human population doesn't know a thing about those monsters; only a secret organisation tries to hunt them down for the sake of mankind. Also, both protagonists are member of this organization. Blood+ and RwTnYwM also share the fact that the protagonist is struggling with the fact of not being human, but still trying to be with them.
If you liked
Heureka
|
...then you might like
Alexandros: Sekai Teikoku e no Yume
|
Both are historical manga set in the ancient times. They're also both rather serious and deal with historical persons and events and do portray them in a rather believable matter. Furthermore, the two of the create a very similiar atmosphere.
If you liked
Thermae Romae
|
...then you might like
Nobunaga Concerto
|
They're both historical anime which also share the time travel aspect. Furthermore, they show the cultures of the time periods they're set in very well. Both provide some cultural clashes and comical moments as well (Thermae Romae is a pure comedy anie while Nobunaga Concerto isn't). In addition, both shows do have a very unique art style a lot of people seem to dislike. Still, they're both amazingly entertaining.
If you liked
Blood+
|
...then you might like
Blood-C: Izayoi Kitan
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Both are mangas who differ from the anime they have as their origin. Even though the Blood+ manga does differ in storyline, it doesn't in setting, while Blood-C: Izayoi Kitan uses a different setting than its parent story, Blood-C (so it's pretty much a prequel). However, both seem to focus more on light and friendlier setting than both of their rather dark and unhappy anime counterparts. They both have action, mystery and homour. Still, they revolve around the same topics, like fighting demons, and a girl named Saya, who is the only one who can stop them.
If you liked
Terra e... (TV)
|
...then you might like
No.6
|
Both are set in a futuristic setting in which the government wants to have full control over it's residents. They also share the same type of protagonist, a young boy suddenly ripped out of his surroundings and now has to learn the truth behind his ideal world. You also can see some similarities in other characters like Nezumi is pretty much like Keith.