Hulkling (Theodore "Teddy" Altman) is a fictional comic book superhero and a member of the Young Avengers, a team of superheroes in the Marvel Comics universe. Hulkling's appearance is patterned on the Hulk. He has shapeshifting abilities that go far beyond the ability to mimic the Hulk, and superhuman strength.
Hulkling was created by writer Allan Heinberg and artist Jim Cheung and first appeared in Young Avengers #1 (April 2005) along with other teenage heroes patterned after founding Avengers members.
Hulkling was originally planned to be a female character. According to Tom Brevoort, "Originally, Allan pitched Hulkling as a female character using her shape-changing abilities to pose as a man. I suspect this was as close as Allan felt he could get to depicting an openly gay relationship in a Marvel comic. But as we got underway... he started to have second thoughts and approached me about maintaining Hulkling and Wiccan as two involved male characters."
He also featured in Civil War: Young Avengers/Runaways and appeared in the Civil War crossover event.
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Official Site: Marvel Website
Links: Hulkling Wiki Gay league Profile Marvel Comics Wiki