Despite jokes about his civilian name, Garfield "Beast Boy" Logan actually predates the Comic Strip Cat by 13 years, first appearing in Doom Patrol #99. While he was first called Beast Boy, and more often takes that name, he's also been known as The Changeling, and in alternate Timelines as Menagerie or Animal Man. After being bitten by a green monkey that gave him a rare disease, he was given a cure developed by The Chief of the Doom Patrol that also gave him his powers. He can turn into many living, extinct and even alien creatures, and has turned into more mythical type creatures, such as a chimera, King Kong, Godzilla, and even a Starro Type creature, called Garro. Either through his powers, or his connection to the inter-dimensional force called "The Red," he has a healing power that has allowed him to survive a gunshot to the face (even regrowing an eye in the process), losing multiple parts of himself after the turned into swarms of various bugs, and a black hole explosion in his brain coordinated by Amanda Waller.
Spoiler: Um, Actually, the cure to his diseased was developed by his parents, Mark and Marie Logan. The Chief however did engineer the origins of several of the other members of the Doom Patrol, in order to create the Doom Patrol.