It is unknown what Greg's personality is like, although he does seem sensitive, due to him shedding a tear when Mr. Peanutbutter calls him annoying.
Greg is a human man with red hair, thick red eyebrows, and stubble on his upper lip and chin.
He wears a yellow and maroon plaid collared shirt, pants, and shoes.
In Surprise!, while arguing with Pickles after he confesses his infidelity, Mr. Peanutbutter brings up Greg, the guy he met at the gas station. Pickles asks why is he bringing Greg up, and Mr. Peanutbutters says he doesn't know, but Greg sucks too. Greg is then seen in the background with tears in his eyes.
- His last name was never revealed.