 If you liked
Kujibiki♥Unbalance
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 ...then you might like
Hayate no Gotoku!!
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Both feature a cast of characters ranging from strange to deranged. Especially the student council president has striking similarities (from popularity to power). Kujibiki Unbalance as a part of the Genshiken Universe is a little more serious than Hayate no Gotoku and somewhat retro, but nevertheless entertaining.