??? is a green-colored left arm with a decrepit black wristband.
In it's profile and "Freaking Out", ??? has a green eye in the middle of its palm with black sclera.
- It is unknown the reason why this spirit is running away from Shiromori, or the reason why it wanted Lewis dead.
- It is unknown who this spirit actually is. All we know is that possessed Arthur's arm and possibly tried to frame him for killing Lewis.
- For the first half a second of 0:11 in Mystery Skulls Animated "Freaking Out" ??? appears to be in a cold sweat from seeing Shiromori as indicated by a bunch of light green dots which momentarily appear and cover ???'s 'body'.
- This indicates that ??? and Shiromori may have met before.
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|Characters in Mystery Skulls Animated|
|Protagonists||Arthur • Vivi • Mystery|
|Antagonists||Lewis • ??? • Shiromori|
|Minor characters||Dead Beats • Living Portraits • Mr. & Mrs. Pepper • Lance • Galahad • Duet • Chloe • Rooster|