Bob is one of the Ziraxia characters.
He is the Ziraxians' cute pet space octopus. According to their space handbook, they need to keep a close watch on him because he appears to be a baby and his functions are unknown. He is often seen waving 'hello' while sticking his tongue out in a cheeky, playful way.
He is a green octopus with a round bulbous head, tentacles, and a tuft of purple hair. He has big red eyes all around his head, even in the back.
His species is known as "The Great Young Ones". They only arrive from in between the stars when they align in a certain pattern. This is alluded to on Bob's promo image, where he is in front of a star design.