Great design, I love the contrast between the black body and bright hair.
And if you wish to have him as your 'sona, go for it! A persona doesn't need to represent your real gender, and the "symbol/cutie mark = talent" thing is a FiM invention. I think most of us have just picked things we like as symbols, or things that are somehow an important part of our lives. There are no real rules for persona designs.