You might like Asu no Yoichi or Love Hina - they're Harem genre rom-coms...Or Wallflower which is a reverse harem like Ouran.
Or perhaps the films "The Girl who lept through Time" and "Summer Wars" which are worth a watch regardless (well, from my point of view lol)
Though if you're looking for something light on plot and heavy on comedy I suggest Azumanga Daioh. xD Hope that helps ^^
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