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He is a large purple cat with yellow eyes.
He is revealed to be a leader of the Pacifist Faction of the Nebulans who tried to save the planet Sirius before it was destroyed.
Sensei is capable of transforming into a small mech that Soya pilots after being swallowed by him. Sensei also has a spaceship that looks like his normal form, but at a massive scale.
- His meows can be translated into sentences of variable length.
- He only says "Nya" in varying tones, and Ginko translates accordingly.