Rababou is a little star world creature forcibly sent by Higenoshita to aid Comet into finding the prince of the Tambourine Star World. He can easily detect twinkles with his tail and can inflate himself to fly, making him very useful for collecting star power. If he isn't exposed to the outside world, he is hiding in Comet's Twinkle Star.      Even though Rababou appeals to others as a cute little toy, he constantly nags Comet into staying on task, but Comet only believes that he should go out and have some more fun. Rababou may order his princess around a lot, but he truly cares for her as a friend and a princess. Rababou is one of the only people (well, in his case star world creature) that Comet can confide her feelings in. Later, Rababou falls in love with Spica's star world pet, Rabapyon.

In a magical part of the galaxy, the prince of the Tambourine star world has been betrothed to marry one of two princesses; but Comet, the princess of the Harmonica star world, couldn't care less. Thus, much to her dismay, when the prince flees to Earth to escape his fate, Comet is sent to find him and return. Now, with the power of the stars and a magical locket, Comet sets out on an adventure to find the prince, have fun, and experience the life of an earthling first hand.

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The story revolves around Princess Comet, a twelve-year-old girl who is also the princess of the Harmonica Star country of the Triangle Nebula. She was meant to meet the prince of the Tambourine Star country at a ball, but the prince ran away to Earth instead. As it turned out, Comet is sent to Earth to find him, though she has no idea what he looks like. "He will be known by the twinkling in his eyes" is the only clue she was given to the prince's identity. Once she travels to Earth, Comet falls in love with the people she meets there as well as the planet itself, quickly becoming attached to life on Earth.
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(Source: Wikipedia)