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If you liked IS: Infinite Stratos add

...then you might like Masou Gakuen HxH add

Both shows are harem, ecchi, and mecha anime. The male protagonist never is seen as the strongest character in either series, and the male protagonist's sister is the authority figure of the show. They both battle against robots or other mecha. These two shows are essentially identical, with Masou Gakuen HxH having more ecchi scenes and a more fleshed out plot.