Ben 10,000 as ArctiguanaAs his name suggests, Arctiguana's appearance somewhat resembles an iguana. He is a cold-blooded alien (as normal reptiles) whose blood is very cold in the literal sense.[OV Brief 1]

In the Original Series, Arctiguana had small spikes around his face, three dorsal fins reaching down his back and white gills on the sides of his head. He had white pants and a black open-front shirt with white cuffs and he wore the Omnitrix symbol on his left hand.

Ben as ArctiguanaIn the Ultimate Alien intro, Arctiguana looked exactly the same as before, except his eyes were green, the white part on his left glove became completely black, his mouth was blue, and he wore the Ultimatrix symbol on his chest.

In Omniverse, 16-year-old Arctiguana still retains the clothing from his previous designs, albeit it goes all the way up to his head and his chest is completely covered up with a white underbelly shell. He has four pointed fins instead of three and the black stripes on his face do not go through his mouth anymore, as they now go around his mouth. The spikes on his face are now on his chin and his gills are no longer visible. The claws on his front feet are pointier and less dexterous, and he now has two claws on each of his back feet. He wears the Omnitrix symbol on his chest.

Albedo as Negative ArctiguanaNegative Arctiguana looks the same as 16-year-old Arctiguana do in Omniverse, except his skin is recolored pale blue or more of a dark purple shade, the white parts of his clothing are recolored dark red, and his eyes and Ultimatrix symbol are recolored red.