Rippen is tall and muscular with pale green skin. He has black hair with several greenish-gray streaks, along with a goatee, and he has red eyes and pointed ears. He wears a dark gray business suit with light gray sleeve ends and collar, a red tie, black pants with a black belt, and black shoes. When he's being an art teacher, he wears a gold-colored apron with paint smears and pockets to hold art supplies.
Rippen is diabolical, menacing, and calculating. He is willing to use underhanded tactics to achieve his goals, like destroying Penn's MUHU if Penn doesn't turn the sleigh around in "North Pole Down". His main ambition is to become a full-time villain, and he'll do whatever it takes to achieve it, even desiring to get rid of Penn once and for all. Being very serious, Rippen gets easily annoyed with Larry's antics and anything that goes wrong. He is also short-tempered, quickly losing his patience and cool demeanor when his plans are threatened.
In "North Pole Down", Rippen describes Larry as the most loyal yet least evil minion ever. Rippen is often annoyed with Larry's cheerfulness and bubbly personality. Rippen dislikes listening to Larry's ramblings and has a lot of impatience with Larry's mistakes.
Believeing Boone to be an incompetent fool, Rippen doesn't consider him much of a threat. However, Boone, as a genie in "The Fast and the Floor Rugs", tricks Rippen out of two of his wishes and from destroying Penn, much to Rippen's fury.
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