Total Recommendations: 3
If you liked
School Days
|
...then you might like
Mirai Nikki (TV)
|
Both have yanderes.
If you liked
IS: Infinite Stratos
|
...then you might like
Kyoukaisenjou no Horizon
|
Both have futuristic settings and large casts of characters. Both are more harem driven than mecha driven.
If you liked
Hellsing
|
...then you might like
Black Lagoon
|
Both series are heavily action oriented and have a dark setting. Alucard and Revy are the Juggernauts of their series.