 If you liked
Trinity Seven: 7-nin no Mashotsukai
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 ...then you might like
Yamada-kun to 7-nin no Majo
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Both manga has a male lead who are involved with 7 girls and the seven girls each has their own power which the male lead can use or "copy". The male lead both creates a harem out of these seven girls.
They are both hell-funny comedy and romance mangas except yamada has another genre gender bender
The magic 7. In essence, there are seven different female characters in both series with extraordinary abilities. The main male protagonist gets involved with them in the story that gets complicated as we learn who and what their abilities are. Both series also adapts sub-plot romance that develops over time. Both series also contain mysterious origins regarding not just the characters but also events from the past that influences the story of the present.