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Marrow is a mutant. Specifically, a Morlock, a sect of mutants that live under the sewers of New York City.
Marrow, or Sarah, her only given name, was a small child when the Mutant Massacre, wherein a group of mutants known as the Marauders led by Mr. Sinister slaughtered many Morlocks, occurred. She witnessed the mauling of Angel, and was later rescued by Gambit. Sometime later, she and most of the other Morlocks were sent to another dimension to be trained as part of the mutant terrorist group Gene Nation. During this time, the former leader of the Morlocks, Callisto, took her under her care, becoming a mother figure to her. She soon rose to the top of Gene Nation's ranks, and when they returned to this dimension, only a few years had passed. Gene Nation clashed with the X-Men a few times, but the major battle came when she fought Storm, one on one. She wired a bomb to her heart and tried to use it to make Storm, who was another former leader of the Morlocks, yield. Storm responded by tearing out her heart. Luckily, as part of her mutation, she was born with two hearts, and survived. She later joined the X-Men for a brief period, but is now back to her terrorist ways.
Marrow is a young woman with short cropped hair, and bony protusions sprouting from her back. These can be used as weapons. She also has thick bony plates on her chest. During her brief time with Weapon X, she was given surgery to alter her appearance to that of a normal woman, but this later proved to be temporary.