Cosmo is a brown pastry resembling a Swiss Roll. He has white icing drizzled in a squiggly pattern on the top of his head, which is paired with cyan, pink, and lime star-shaped sprinkles as freckles. He wears a white, sleeveless hoodie with black drawstrings and a white hemming on the bottom. He has striped socks the same color as his sprinkle freckles that completely cover his legs.

Cosmo is a helpful, yet cautious Toon. He shows anxiety within his dialogue whenever he finishes a Machine.