Marrow

Marrow is a mutant.

Powers
Hyper-accelerated metabolism: Her metabolism is the basis of what fuels her abilities to the way that they have manifested.
 * Accelerated bone growth: Marrow has the ability to control the growth, shape, and toughness of her bone structure. Initially, this was uncontrolled as they constantly protruded from her skin at an uncontrollable rate but, after enhancement by a Skrull medical facility and later by the Weapon X Program, she learned to mostly control her ability, retaining a more cleanly appearance despite each enhancement administered having partially failed over time. Marrow's body generates bony protrusions which she can remove, though not without pain, and wield as weapons or even as a form of protective shielding or armor by covering herself with it. She can utilize this power in many ways, including the creation of knuckle guards, spears, blades, rigid tendrils, bone claws, fingernail protrusions, and projectile spikes. While with Weapon X, Marrow had more control over her protrusion and was able to hide them, appearing normal and was able to form more complex shapes of a higher quality similar to ivory. After having regained her powers under Volga's power restorative experimentation, Marrow regained complete control over her power, possibly strengthening it at the cost of her sanity.
 * Superhuman durability: Her skeleton seems to be more durable than normal, since she has easily survived heavy hits on several body parts. For example, Flag-Smasher hit her twice with his mace on the head without causing much damage and Sabretooth threw her against a wall with no result on her inner bones. She also jumped off the Brooklyn Brdige twice without any major damage, being able to walk normally afterwards. Recently, this aspect of her gift has been taken to extreme, once growing numerous bone spikes all over her body and then ramming head-first into an equivalent of a sky-borne albatross like a cannonball without much injury to her constructs.
 * Superhuman regeneration: This power allows her to heal from the wounds she gives herself while removing the bones from her body. Her healing factor also grows her bones quickly and regenerates them when they need to be replaced.
 * Superhuman strength
 * Superhuman agility
 * Superhuman reflexes
 * Dual hearts: She possessed two hearts to compensate for her random bone growth so, when Storm ripped out one, she was able to survive. It is possible that the first heart could have regenerated due to Marrow's healing factor.