Sensei Kanoi Watanabe

Sensei Kanoi Watanabe is the mentor of the Wind Rangers and later the entire Ninja Storm Power Ranger team and father to Cameron Watanabe.

Early Life
Kanoi was originally an air ninja, and is also the brother of Lothor. When Lothor attacked the Wind Academy, he used his magic to turn Kanoi into a guinea pig, albeit with the ability to speak and bipedal movement. (This is a parody of Master Splinter from Teenage Mutant Ninja Turtles)

Ninja Storm
Kanoi sensed potential in the three students, Shane, Tori and Dustin who became the Wind Rangers, and knew that the Scroll of Destiny had foretold that they become Power Rangers.

He also sensed potential in his son Cameron, but had promised his wife that he would not train Cam in the ways of the Ninja. So, instead, Cam learned to become a samurai, and met his father in the past before obtaining the Samurai Cyclone Morpher.

In a later episode, Cam created a machine that should have returned his father to a human, but instead he swapped bodies with both Shane and Dustin, before finally returning to his trapped hamster body. It reveals he's proficient in Earth Style, despite beginning his ninja training as an Air Style Ninja.

Kanoi was eventually restored to human form, and returned to the Wind Academy.

Dino Thunder Encounter
He was later captured and impersonated by a vengeful Lothor, who tricked the Wind Rangers and turned them into his servants. Kanoi later escaped with the help of his nieces Marah and Kapri, and helped Cam and the Thunder Rangers recover their powers from the Abyss of Evil. He then worked together with Hayley to advise the Rangers in their team-up battle.

Personality
Sensei was extremely wise and showed to be a great mentor even in the form of a guinea pig.