Sensei is a penguin prophet that first appeared digging out the Dojo when it got hit by lightning, claiming he had returned from a long journey. He used to be seen at the Dojo Exterior, but now he can be seen inside the Dojo, sitting on a cushion next to a variable colour pot. He is the only penguin to where the colour Grey. Sensei appears to be a old penguin. He has a white beard, thick white eyebrows and a traditional Japanese straw hat. Sensei refers new ninjas or students as grasshoppers. Sensei is Japanese, so in Japanese he is a foreigner. No one knew he was going to be a character. He is the oldest penguin in Club Penguin.

Sensei also started Card-Jitsu which is a card game he has explored the wilderness many times. Sensei also created Card-Jitsu Fire, Card-Jitsu Water, and Card-Jitsu Snow.