As a youth Rachel Leighton moves to New York from Texas and eventually grew up with the wrong crowd and joined a street gang lead by the man later known as Crossbones whom her brothers tried to attack after he had beaten and raped her. During the attack Rumlow one of her brothers was killed .Over time she later was trained at one of the schools ran by theTaskmaster and soon after was a founding member of the Serpent Societywhere she fought and later fell in love with Captain Americaand turned over a new leaf. She now works as a mercenary, both freelance and with B.A.D. Girls Inc.

Powers and abilities

Diamondback is an athletic woman with no superhuman powers. She was trained in gymnastics, and at pitching small ballistic objects with great accuracy, and at piloting small aircraft. She also has knowledge of general street-fighting techniques, and some jujitsu.

Diamondback wears a costume made of a unique synthetic fabric lined with a Kevlar weave, with two bicep and two thigh belts for carrying throwing diamonds, concealed pockets in the boot tops, boot-heels, glove tops, and brassiere for other throwing diamonds, and throwing diamond earrings.

Her equipment was originally designed and manufactured by the Trapster, butafter a time she turned to the Tinkerer to design and manufacture her weapons .Her personal weaponry consists of throwing diamonds, which are actually 4 inch hollow zirconium octahedrons (though not made of diamond, they are shaped like diamonds) containing various substances; spent uranium, plastic explosives, nitric acid, tear gas, smoke, curare-derived narcotics,.