User blog comment:Maki Kuronami/Everyone is ambidextrous/@comment-9090085-20140730021656

I seem to recall it being mentioned the at least Ruby and Weiss are left-handed; but that, for the sake of awesome fight scenes, everyone is ambidextrous.

I suppose it might be a little like Train from Black Cat: He's ambidextrous, but was originally left-handed; thus, while he normally shoots right-handed without difficulty, he shoots a little more accurately left-handed.

(I'm basically saying keep the "handiness" attribute; just keep in mind that characters will switch hands if they need/want to.)