Sensei, or The Sensei (formerly known as ?????? during the Dig Out The Dojo project to conceal his identity, temporarily known as Obi-Wan Sensei during Star Wars Takeover) is a Ninja that who first appeared digging out the Dojo in November 2008, when it got hit and damaged by lightning, claiming to have returned from "a long journey" in the wilderness of Club Penguin. He used to be seen at the Dojo Exterior, but now he can be found inside the Dojo, sitting on the cushion next to the variable-color pot, and also in the Fire Dojo and Water Dojo. He wears the color gray, which is currently not available to players. He trains penguins in the ancient art of Card-Jitsu.
Sensei is an old penguin, and a master of all elements. He has a White Beard, thick white eyebrows, traditional Japanese straw hat and a Simple Walking Stick. Sensei refers new ninjas or students as 'grasshoppers.' Sensei is Japanese making him one of the four foreign characters in Club Penguin. The others are Herbert (from North Pole) PH (from Australia) and Aunt Arctic (from UK). Sensei is a master of Card-Jitsu, and is also a teacher of it. He has a childhood best-friend named Tusk (a walrus), who is his bitter rival. Sensei uses a broken tusk from this rival as his walking stick.
- Sensei has a Party Hat, but he just never wears it.