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The Death Kwon Do Instructor, Sensai, is an overweight martial arts instructor who teaches the fighting style of Death Kwon Do, using a notebook full of drawings as his technique book. He is voiced by Sam Marin. He often reacts to bad news by shouting "NOOOOO!" He only appears with a few lines/quotes. In "Death Kwon Do-Livery," he is revealed to have an apprentice, Jerry-San. He returned in the episode "Sandwich of Death" as the owner of Death Kwon Do Pizza and Subs.
He is overweight, and has orange, or strawberry-blonde hair, as a "crappy" mullet. He also has a mustache and wears a white headband and cut-off jeans. He has curly chest hair, and thick arm hair.
- "Death Punchies" (debut)
- "Rigby's Graduation Day Special" (cameo)
Overall: 7 Appearances
- He believes in hard work and determination, because he wouldn't give Rigby the death punch move immediately.
- Even though the real word is "Sensei," in the credits, his name is written as "Sensai".
- His hair is brighter in "Sandwich of Death".
- He is seen numerous times with an incorrect number of fingers.
- In "Death Kwon Do-Livery", he is seen with both 4 and five fingers, and even with both at once, making nine fingers total.
- His design may be an inspiration for that of Randy, a character from J.G. Quintel's new series Close Enough.