Heroes for Hire (1997) #18
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Colleen Wing was raised in Japan by her grandfather Kanji Ozawa, who taught her the ways of a samurai, in which she became highly skilled, after which she teamed up with Misty Knight at the behest of Tony Stark as a new Heroes for Hire tasked with capturing superhumans who have not registered.
Shang-Chi is the son of an internationally-renowned and powerful criminal mastermind whose childhood was a lonely one, full of constant training in rigorous mental and martial arts, with only limited contact with his parents.
Born with super-human senses and the power to heal from almost any wound, Wolverine was captured by a secret Canadian organization and given an unbreakable skeleton and claws. Treated like an animal, it took years for him to control himself. Now, he's a premiere member of both the X-Men and the Avengers.