X-23

X-23 is a female clone of Wolverine created by HYDRA. The clone possessed two retractable claws in each hand (instead of three like Wolverine) and one similarly retractable claw in each foot (something Wolverine lacks). The clone was identified only by the codename X-23 — the first success after 22 failures. Denied the life of a normal child, X-23 was lonely and violent. She had almost no companions and had been under observation her entire life. She had to spend most of her time training to hone her skills. When she was 12, her entire skeleton was infused with adamantium.

Upon learning about her genetic origins and raiding a S.H.I.E.L.D. facility to get information about his whereabouts, X-23 angrily decided to get revenge on Wolverine, whom she held responsible for her creation. She invaded the X-Mansion and handily defeated the other X-Men and New Mutants inside. When Wolverine confronted her, he calmed her by pointing out that he knew what she was going through and that he is the closest thing to family she has, and instead of turning her over to S.H.I.E.L.D. like Nick Fury wanted, he let her go. Later, Wolverine would encounter X-23 again, on the run from Hydra's agents as well as S.H.I.E.L.D. She allowed herself and Wolverine to be captured, with the intention of using this as a way into Hydra's mobile HQ. She succeeded in destroying the craft, apparently perishing in the act, but Wolverine catches a scent, a hint to him that she was still alive and he is right when X-23 is seen on a rock peak and jumps down. Months later, she joins the X-Men as a permanent member of the team.