Marvel Comics mutant who can freeze his own body

ICEMAN

This founding X-Men member once struggled with controlling his powers and has a playful, wisecracking personality. Look for a name that matches his chilly abilities.

This clue points to Iceman, a well-known Marvel mutant with cryokinetic powers—meaning he can generate and control ice. The hint plays on his signature ability to freeze his own body, turning it into an icy form for combat or protection. He’s a founding member of the X-Men, so fans of the comics or movies would recognize him right away. The answer is straightforward since "Iceman" directly ties to freezing.