Spamton appears as a diminutive robotic ventriloquist's dummy that wears yellow and pink glasses that sometimes change colors and a long-sleeved black V-neck shirt, with black hair that is slicked back, appearing similar to a pompadour.
After becoming Spamton NEO, Spamton assumes the form of the machine he inhabits. The body of this form looks like a disheveled Mettaton NEO with a gaudy pink and yellow color scheme, and a laser cannon mounted onto his hand. Countless green wires suspend him in the air.