Sensei is the main teacher of Card-Jitsu, and was one of the Penguins to dig out the Dojo.
- He is the only Gray Penguin on the island.
- Sensei also founded Card-Jitsu.
- At one point, when Sensei was digging out the Dojo, he went by the name ???????.
- Sensei may be related to Rockhopper.