Ninja Rockhopper

Ninja Rockhopper will be related to Sensei. He will also become Sensei Rockhopper.

Ninja Rockhopper Island
This will be where he trains pirates and red puffles to become ninjas and eventually Senseis.

Ninja Yarr
Ninja Yarr will be Yarr in ninja form. Rockhopper will have taught Yarr to be a ninja on Ninja Rockhopper Island.

Proof

 * The only known proof is that Rockhopper is probably related to Sensei.