Roger is hyperactive, friendly, talkative, and not very bright at times.
In the movie, the voice of Roger Rabbit is performed by Charles Fleischer, who was known for electing to wear an actual rabbit costume on the set to get into the role. One of his famous traits is his voice, "P-b-b-b-b-bleeeease!". He is a white clownish rabbit with a gap between his front teeth, a voice that resonates of Huntz Hall in "The Bowery Boys", a blue Porky Pig-like bowtie with yellow polka dots, a Droopy-like hair, a Bugs Bunny-like head with blue eyes, a pink nose and round-tipped ears, red Oswald-like pants with a green patch behind and Mickey Mouse-like gloves (yellow ones).
Roger does not take well to alcoholic beverages; it is shown twice in the film that when he has consumed one, he changes color rapidly, at least one of his eyes swells, his head spins and he mumbles incoherently at a fast pace, before stretching up into the air and whistling like a steam train at a loud enough tone to shatter glass, all the while spinning around. Afterwards, his mood swings violently.