Of 1000s of things that are demanded...if you have to narrow it down to 3 things which you cannot live without, what would be those 3 things in a guy?
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The best sense of humor in the F***ING world! If he has no sense of humor and he's a bore, I'd never even consider him as a friend, much less anything else...
Musical talent - and I mean true musical talent, that he's actually been blessed with musical genes, and not just the ability to hold a bass, or recite lyrics! xD That's just ridiculous!
That something - he has to have that something...I won't say solely charisma, because that's not all of it, but some sort of charm that he exudes...I think you can tell what I'm talking about. And this can't be influenced, this is actually something you either have or don't have. --this is different for each person, and you don't have to be the hottest guy on the face of this earth to have it!
...for example - Ben Barnes is beautiful, but he just doesn't have it: link ...and that makes him seem to me like he'd be a better friend material rather than boyfriend material, because kissing him would be like kissing my brother... :/
(I've seen some interviews with him - in the interviews you can see if someone has that something, and he just doesn't... )
Hope I helped