Polari

Polari is an elderly dark brown Luma who appears during the events of Super Mario Galaxy. Said to be one of the oldest Lumas in existence, Polari serves as Rosalina's most trusted adviser. Having extensive knowledge of the Comet Observatory, Polari serves as a guide of sorts to Mario, showing him a map of all of the galaxies visible from that location.

Polari shows certain similarities to Toadsworth. Both are probably the oldest of their respective species, both are highly protective of the person they advise, and both have a brownish color which is unusual if compared to others of their species. He is additionally shown to have wisdom that proves useful to Mario on his adventure.

Like all Lumas, Polari loves Star Bits and may thank the player if they shoot a Star Bit at him.

Super Mario Galaxy
Polari first appears in Super Mario Galaxy when Mario retrieves the first Grand Star and lands on the Comet Observatory. Polari looks at the beacon with Rosalina and exclaims that "now the poor Lumas may survive". When the player first enters the Terrace they will meet Polari and a Blue Luma that soon transforms into a Pull Star to allow Mario to travel to galaxies. When Mario returns with one Power Star on his belt, Polari will teach him about Star Bits and how Lumas love eating them. Other than that, Polari's main importance within the game is to provide a map of all the galaxies that Mario can visit and their Power Stars and to inform Mario about when the enemy base has been located.

Super Mario Galaxy Trading Card Description
''An elderly black Luma that is one of Rosalina's most trusted advisors. Polari serves as Mario's guide to the cosmos from the domes on the Comet Observatory. Polari wiil show Mario a map of the galaxy showing where he's collected so far.''

Physical Appearance
Polari, unlike all other known Lumas, is a very dark brown color and has light blue eyes. He is relatively the same size as all other Lumas, though.

Trivia

 * It is possible that Polari's coloration is a reference to brown dwarfs, objects similar to stars that are too small to start hydrogen fusion. He can also be a reference to black dwarfs, which are very old non-living stars.
 * Polari's name comes from the star "Polaris", also known as the North Star. His name can also be a pun of polarity, which is the brightness of a star.
 * Polari makes a distinctly different noise when compared to other Lumas.
 * It is not known what happens to Polari at the end of the game; he is not seen flying into the giant black hole, and in the secret ending, he does not appear alongside Rosalina or in the Comet Observatory at all.
 * Though Rosalina appears in Mario Kart Wii and Super Mario Galaxy 2, and he was usually at her side, he does not appear in either game. It is possible that he has to take care of the Comet Observatory in her absence.