Carl Wheezer

Carlton Ulysses Wheezer is a fictional character from the American computer animated television series created by John A. Davis and Steve Oedekerk. Characterized by his extreme obsession with llamas and trademark high-pitched voice, he is one of Jimmy’s best friends.
The character was played by voice actor Rob Paulsen who also provides the vocals for his alien equivalent Doppy in its spin-off series Planet Sheen.
Character.
Personality.
A glasses-wearing boy with very low intelligence and one of Jimmy’s best friends, Carl is characterized by his unhealthy obsessions of llamas which is a running gag throughout the series. Aside from said obsession he is a slight coward to Judy who he had developed a crush on as shown in a few dozen episodes alongside her husband Hugh. His unhealthy love for llamas stemmed when his parents inflated their cable lineups with a show within a show entitled Llama Boy the Superhero. From that point onwards, he goes to drastic measures to emulate them going far enough to a fan club nicknamed the Llama Love Society which is likely invented by himself.
Worthy to note, he has a severe allergen to lima beans, bacteria, and horror stories. Whenever he gets fatigued his mother makes him hot milk, rubs his stomach, and harmonizes nani nani nani.
Carl also has another unhealthy relationship with any types of food imaginable even if they are inedible which is a trait passed from his parents using an edible consumption substitute since they are allergic to nearly everything. Furthermore, he gets quite jealous on Jimmy’s extreme intelligence and 
gaining constant attraction from other girls besides Cindy. Carl has an absolute hatred on testing out his gadgets and serums coming from the fact that they often cause him fatalities or being in a state of endangerment.
Appearance.
A rotund 10-year-old characterized by his trademark high-pitched voice, Carl has red hair in a weird splat style, small black bead eyes in contrast to the other characters with colored irises, and brown circular spectacles alongside freckles in cheeks. During the series, he wears a yellow shirt with orange stripes alongside overall straps which were not present in the green pants and brown loafers while in the test pilot, he greatly resembles his father. Additionally, he has a very slight hunchback.
Portrayal.
In both the series and film, he is played by professional voice artist Rob Paulsen. Besides this role, he also lent his vocals to his alien equivalent Doppy in its spinoff series Planet Sheen. Paulsen voices his parents as well and one-shot characters including the owner of a Golden Arches parody nicknamed Skeet in the episode “Men at Work.”
In popular culture.
In 2012, a clip of Carl asking for a croissant in a faux-French accent became a popular internet meme.