Marvel Legends Morph interchangable heads

Kevin Sydney is a fictional character appearing in American comic books published by Marvel Comics. Created by writer Roy Thomas and artist Werner Roth, the character first appeared in The X-Men

Sydney first appeared as Changeling, a mutant shapeshifter. He was a short-lived adversary for the X-Men who subsequently joined Professor X and died shortly after, making him the first member of the X-Men to die in action. The character was reintroduced as Morph in the 1990s for X-Men: The Animated Series. An alternate reality version of the character under the codename Morph reappeared in the comics as part of the Exiles in 2001.