A lot of those reasons are mine. Most of the male characters appeal more to me, and since a lot of anime guys tend to be guess-the-gender in general, my semi-androgynous appearance helps. It makes my mother worried that her only daughter dresses up as a boy... She has good reason to be.
Too bad I'm so short.
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COSPLAYS IN PROGRESS
Canterbury (Kuroshitsuji) - 30% - Kuro Gathering
Utatane Piko - default (Vocaloid) - 15% - Ohayocon
Boris (Alice in the Country of Hearts) - 3%
Armin/Jean/Levy (Shingeki no Kyojin) - 0%