Carl Wheezer

Carl Wheezer is an animatronic seen in Undertale. He is the mascot of Mondo Burger.

Role in Undertale
Unlike Roxanne, the mascot of Good Burger, Carl is not very advanced. He simply twitches around inside Mondo Burger to attract customers. He has a croissant balloon, because Mondo Burger also sells Big Booty Croissants.

When Mondo Burger collapsed at the end of the film, he was destroyed and is never seen again.

Trivia

 * Carl's final design as seen in Jimmy Neutron: Boy Genius is somewhat inspired by this design. During Undertale (and Jimmy Neutron)'s production, he had a different design.
 * Similar to John Kricfalusi, Freddy Got Fingered, Sans, and Savannah's B-Bot, who also have insignificant roles in the movie, he appears on the poster for Undertale. This does not make any sense.