If you liked
Aa! Megami-sama! (TV)
|
...then you might like
Sora no Otoshimono
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Both series are comedies centered around angels being sent to earth and living with a normal human boy.
If you liked
Zombie-Loan
|
...then you might like
Kore wa Zombie desu ka?
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Both series have zombies as main characters, and deal with supernatural fighting/aciton scenes.
If you liked
Blood+
|
...then you might like
Kara no Kyoukai Movie 2: Satsujin Kousatsu (Zen)
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Both series feature eerie supernatural elements, lots of gore, strong female leads who posses powers that are unrivaled, lots of action, and beautiful character development as the protagonists figure out who they really are. These are such beautiful series, and I recommend any fan of either one sees the other.
If you liked
Chobits
|
...then you might like
DearS
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These animes are incredibly similar. In Chobits, the hero finds an abandoned super advanced robot called a Persocom, and decides to take it in as his own. In DearS, its basically the same plot but with a beautiful Alien instead. In Chobits, Persocoms serve humans and have a large impact on the human's daily lives. In DearS, this also the case. It's also the same kind of humor and similar jokes. With Ren (the alien from DearS) and Chi (the Persocom from Chobits) not understanding the concept of inappropriate behavior and wacky hijinks ensues. The series both focus on helping the alien/robot adjust to normal life. If you like one of these, I guarantee you'll like the other.
If you liked
Ibara no Ou
|
...then you might like
BioMeat: Nectar
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Both manga follow a group of unexpected, unprepared, and mostly unqualified heroes as they are unwillingly thrust into horrific circumstances. Both have lots of gore (especially BioMeat) and chalked full of character development that makes you keep turning the page. They both focus around a fictional biological force that threatens their lives (In BioMeat it's the BM, in KoT it's Medusa) They both focus on people who start off as completely scared and end up being hardened and strong. I would seriously recommend reading one if you already have the other.