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If you liked Hidan no Aria add

...then you might like Sakura-sou no Pet na Kanojo add

Both male protagonists have more than one girl going for them in the series (although I wouldn't consider either of them to be "serious" harem by any means), and at least one of those girls in both series shows their love for the protagonist in creepy, overbearing ways and demonstrates extraordinary skill in a certain area - although Sakurasou probably pulls this off without being as cliché or unrealistic.

If you liked Ookami to Koushinryou add

...then you might like Sakura-sou no Pet na Kanojo add

Although the atmosphere and setting are hardly similar, both series start out with a male protagonist having a strange encounter with an eccentric girl, and having to live with, take care of, and overcome hardships with (or relating to) said girl throughout the anime. The girls in both series are both often called out for their differences by everyone else, and are highly revered for their unique qualities.

If you liked Sword Art Online add

...then you might like Choujigen Game Neptune The Animation add

SAO attempts to pass itself off as having a serious plotline with an added romance aspect, while Neptune is much more lighthearted. However, both series share a similar atmosphere in a game-inspired, futuristic universe, and characters in both series are often seen fighting off monsters and other enemies with swords, spells, etc.