Tyke

Tyke is a Luma that Princess Rosalina gives to Mario to assist him in Super Mario Galaxy. She asks Mario to save a Grand Star and then gives Tyke to him as an aid. Tyke is then absorbed into Mario, giving him the ability the do a Star Spin. The game's prologue shows Princess Peach holding Tyke when Bowser attacks with his airships. Mario is then given Tyke by Princess Rosetta when he awakens on the first planet in the Gateway Galaxy.

In the end, Tyke was sucked into a black hole created by Bowser's sun. It's turns out he was still alive on a small planet.