Marrow

Hyper-accelerated metabolism: Marrow's 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 it, retaining a more cleanly semblance despite each enhancement administered having partially failed over time. Marrow's body generates bony protrusion which she can remove, though not without pain, and wield as weapons. Even acting 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, and even projectile spikes.
 * ​Bone structure durability: Her skeletal structure seems to be more durable than normal; she has easily survived heavy hits on several body parts.
 * Regenerative healing factor: Marrow is able 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 her bones when they need to be replaced.
 * ​Superhuman strength
 * Superhuman agility
 * Superhuman reflexes
 * Dual hearts: She also possesses two hearts to compensate for her random bone growth. So, when Ororo Munroe ripped out one of her hearts, she was able to survive. It is possible that the first heart could have regrown due to the healing factor.