Weaknesses: Dummy's gaseous form is held together by a dummy-like suit and penetration of the suit can cause him to dissipate.
Bio: The autistic young mutant known only as Dummy is a student of the Xavier Institute and takes part in its Special Class. Dummy is actually a sentient smell dwelling within a latex suit that grants him a humanoid appearance and functionality.
Dummy, along with the other students of the special class, followed Xorn as he led them in a field trip to the nearby woods of the Xavier Institute and helped him set up camp. Soon after, they were attacked by the U-Men, humans who harvest mutant body parts and graft it onto themselves. Dummy was struck by a one of the U-Men's scalpel projectiles, and he started to leak away. He was saved by Beak, who covered the hole in his suit with a condom.
The following day, when a riot broke out at the Institute, Dummy's suit was sliced by exploding shrapnel, where his gas-like form was scattered. His final fate is unknown.