Le bump.
Recently I saw the movie Some Kind of Wonderful and fell in love with Mary Stuart Masterson's character, Watts. I thought it was cute how under the sharp, punk-loving, tomboy appearance (which I love, anyway), she had a secret crush on her best friend. I thought it showed strength in her character to go as far as to help him get together with another girl before he even knew how she felt. I was rooting for Watts to the end.
David Tennant, as The Doctor on Doctor Who, generally shows off a bright, confident personality in some dangerous circumstances, which draws me more to him. I'm like one of those girls who's always pining away for him in the recent episodes.
Generally I fall for characters with bold personalities who show a lot of confidence. For girls, a plus is to have very few actual signs of femininity.
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I refuse to answer that question on the grounds that I don't know the answer.