Hello. I don't think that this Idea will be liked by a lot of people, but still worth a try. What about custom MMA gloves from different orgs? You could overlay arms with fists and your gloves around it infront of the normal avatar. You should have different arm-colours, of course. Just a Idea. Or what about different tapes you need to buy for your fighter(magical white tape for everyone in the beginning, i guess) , better tape means less injuries from boxing.