X-23 Berkserk

Just X-23 being a savage, flexing the bullets right out of her wounds

The healing factor is a component of both X-23 and Wolverine that make them a much more visceral and intimidated opponent than a more conventionally durable super human. They take all of your punishment, and feel it exactly how you would. And with focus or sheer rage they shrug it off and keep coming right at you. I always love when they are depicted pretty much going completely berserk in a fight.