Nyou Fiction Forums

Category:  The Melancholy of Haruhi Suzumiya (all series)
Characters: Haruhi Suzumiya, Yuki Nagato, Mikuru Asahina, Kyon, Itsuki Koizumi, Tsuruya, Ryouko Asakura, Emiri Kimidori.

There are more characters, but I just don't feel like typing them all in.

Category: Ladies Versus Butlers!
Characters: Selnia Iori Flameheart, Tomomi Saikyou, Sanae Shikikagami, Kaoru Daichi, Akiharu Ino, Mimina Osawa, Suiran Fo, Saori Shikikagami, Ayse Khadim, Hedyeh, Kaede Tenjoji, Mikan

I happen to be a fan of the type of fanservice this series provides.  in addition to that, the strictness of the school and setting make for a veritable breeding ground of fd stories.

Category:  To Love Ru
Characters: Lala Satalin Deviluke, Haruna Sairenji, Yuuki Mikan, Golden Darkness (Konjiki no Yami), Kotegawa Yui, Yuuki Rito, Run Elsie Jewelria.

I'm assuming this is the format you wanted for suggestions.  Let me know if I missed anything and I'll try to add it.