Total Recommendations: 2
If you liked
Suzumiya Haruhi no Yuuutsu
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...then you might like
Jinrui wa Suitai Shimashita
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Both main characters (Watashi and Kyon) have very similar outlooks on life and get dragged into random events by the other main character (The fairies and Haruhi). Personally I find the fairies more interesting and bearable than Haruhi, but both cause the worlds they live in to be a bit crazy.
If you liked
Elfen Lied
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...then you might like
Freezing
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Elfin Lied and Freezing both have a similar vibe. Both have a pretty dark overall story, both main character girls have a sort of trigger to switch their personalities (even if it is way more apparent in Elfin Lied) and both showcase some sort of nudity. Also the main guy in each of the animes are important and are probably technically the main character, yet they really are much less noticeable.