Guest 666 has a pitch-black head, a black cap with red brim with an “R” on it, and “Roblox” written across their torso and arms. Their hands and claws are a bright red with a black outline, their horns are bright red, their legs are unguligrade, and their feet have a red “flame” effect. They also have a large dark red “mane,” and a bright red tail with the Roblox logo at the tip of it. Most of Guest 666’s body has the metal material, and their kneecaps are spheres with a metal rim above them.