That said, I'll usually always play a male character in a Souls title, because [insert valid reason for inconsistency here.]

I often do this when I want the character to mesh with the build. If I'm playing a character with a great shield and giant hammer, I'll want a big beefy character that is often easier to create in game as a male body. And when I play a quick assassin, I often pick female. It's like the opposite of how anime weapons work.

FYI: as someone I think would like incongruent in girl mode, I went as Dr Frankenfurter (creation scene, was cold) for Halloween this year and went all out: full makeup, fishnets, shaved legs, 4" platform heels, etc. It was very fun and could be a good entry into what you might want to do. Also: you can always dress up at home just for yourself.