I think I'll use a first year person who practices kendo but didn't know they can't use shinai in normal matches so has to develop a new fighting style on the fly. Should be fun and have a lot of mistakes for me and her to learn from. She won't be completely helpless because all of her kendo training does translate to good physical abilities and she's very determined, which helps a lot. Maybe she'll be D because she'll have a good magic to make up for her lack of finesse, and that magic doesn't just help her out in kendo. Or the magic could just be better physical abilities like a shield.