Rukia, if only because she has a greater range of expressions then simply sad and happy like Orihime.
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I agree. Its like Rukia is to friend like to be a possibility while Orihime is to girly and submissive to be taken seriously. If Rukia showed some interest in Ichigo it would make her way hotter then Orihime (in my opinion at least).
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The only problem with rukia is that she doesnt seem to be even thinking about those sorts of things. If, and when, she starts thinking about a boyfriend then she would hotter.[/b]