Princess is Firestar' sister. She is also the fourth, Thunderclan's next leader, and the Forgotten Warrior. This has been confirmed by a random Windclan kit. She will appear in the Forgotten Warrior after a life of being a fat kittypet. Brambleclaw decided to join Windclan, and Firestar is given this prophecy to choose the new deputy-
Choose Princess you idiot!.
After much pondering, Firestar chooses Princess. He then explodes, making Princess leader. She will journey to the moonstone in TFW.
In TLH she defeats Tigerstar with one paw and declares Daisy the next deputy. She banishes Dovewing to oblivion with her powers of epicness and learns the secret of immorttailty from Purdy, who is actually Chuck Norris in his cat form. Together she, Daisy, and Chuck Norris journey to the Moonstone to defeat the evil Spottedbeef who has revealed she can turn into a cow. He mate is revealed to be Blackstar of Shadowclan.
It is confirmed that in TLH Princessstar will have kits.
She will also defeat the evil Spottedbeaf and the whole Dark Forest.
She will be seen in the epilouge playing the flute.