If you liked
Ore no Imouto ga Konnani Kawaii Wake ga Nai
|
...then you might like
Boku wa Tomodachi ga Sukunai
|
Both involve girls who are obsessed with eroge and want friends. Also have similar characters.
If you liked
MM!
|
...then you might like
Boku wa Tomodachi ga Sukunai
|
Both have that "harem" feel to it. While the main lead in Haganai isn't a masochist, girls around both the leading male characters are kind of insane in their own way.
If you liked
Higurashi no Naku Koro ni
|
...then you might like
Another
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A normal boy moves to a new town. Within the first 3 episodes, we see this boy get involved with many creep factors. Both the series consist of blood, mystery, girls who are more than they seem, and just all out thrillers.
If you liked
Higurashi no Naku Koro ni
|
...then you might like
Shiki
|
The first few episodes both of these animes seem to have a calmer feel to them, but as they open up reveal something much darker. Both are packed with blood (At least in the last episodes of Shiki) and have a more psychotic side to them. They also have a good amount of mystery in it, too.
If you liked
11eyes
|
...then you might like
Itsuka Tenma no Kuro Usagi
|
Both have a lead protagonist that wants to become strong for the one he loves. In both of them the lead never does. It has the same cliche childhood friend concept. Both have a seemingly large group of protagonists.
If you liked
Nyoro-n Churuya-san
|
...then you might like
K-On!: Ura-On!
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Both are short 2 minute series that are converted to chibi mode and made purely for laughs.