Bluestar plays an important role during the first series as the leader of Thunderclan, as well as Firestar's mentor. Even after her death she appears again many times as a Starclan warrior. Bluestar first appears in Into the Wild next to Spottedleaf as they receive a prophecy later revealed to be about Firestar. Bluestar also got a super edition named Bluestar's Prophecy, which was released July 28 2009 by HarperCollins.
Bluestar was described as a blue-gray she-cat, tinged with silver around her muzzle, piercing blue eyes and an ugly scar parting the fur across her shoulders.
 Retrieved from Into the Wild, page 64
 Retrieved from Into the Wild, page 15
 Retrieved from Wikipedia, Bluestar's Prophecy
 Retrieved from Into the Wild, page 7
 Retrieved from Into the Wild, page 21