Kid Dinosaur

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Kid Dinosaur was a fictional character from the Wild Cards anthology series, and was created by Lewis Shiner.

Arnie Fentner was a normal kid, obsessed with Dinosaurs and comic books, just on the cusp of puberty, when the dormant Wild Card virus he'd inherited from his mother turned active, altering his DNA and restucturing his body. He was one of the lucky few who didn't die, and one of the one percent who gained superhuman abilities as a result; in his case, the power to restructure the molecules of his body to assume the shape of any Dinosaur that he knew about. The only downside was that his body's mass remained constant, so he could only become a kid-sized version of a Tyrannosaurus rex, Pteranodon, or a Triceratops. Still, it gave him what he'd always dreamed of; the chance to take part in the adventures of Aces.

Spoiler warning: Plot and/or ending details follow.

Arnie's love of adventure would be his downfall; he was one of the impromptu group of Aces organized by Fortunato and Dr. Tachyon to fight the Astronomer and his minions. The Astronomer marked all those who'd humiliated him for death, and on Wild Card Day (September 15), 1986, the Astronomer tracked down Arnie in a crowd at Jetboy's Tomb, and, as Fortunato watched helplessly, the old man tore Arnie's heart out.

Wild Cards series editor George R. R. Martin noted in his afterword to the 2004 edition of Jokers Wild (the novel where Kid Dinosaur's death was depicted) that the Kid was created specifically to be a victim of the Astronomer's vengeance, in answer to protests from loyal fans of the character.