Jaystar

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The Beginning
Jaystar is the leader of ShadowClan, he is seen during gatherings, Until Chapter 11, where the chapter is based on him. Adderstar tells him that Fernkit, who is Fernpaw at this moment is from ShadowClan.

Jaystar obviously being ambitious and wanting his clan to grow more. Shinespots tells everyone that he killed kits, and Fernkit was under danger of dying to him, so Fernkit was really young, so they placed her visibly on the RiverClan border where she could be safe, and luckily, she didn't move, so she was found by Shinespots, who gave her to Waterwhisker.

The End Of Nightstar
He has not yet been mentioned, but he is dead, and is now residing in The Dark Forest.