Ashfur

Born in ThunderClan to Brindleface and Whitestorm, he was initially known as a courageous and loyal warrior. As an apprentice, he and his sister Ferncloud famously helped lure a pack of dogs to the gorge to avenge their mother, who had been murdered by Tigerstar. He also participated in the battle against BloodClan, where he helped kill the deputy, Bone. His character changed significantly due to his obsession with Squirrelflight. After she chose Brambleclaw over him, he became consumed by bitterness and a desire for revenge. This led him to conspire with Hawkfrost to trap Firestar in a fox trap, nearly costing the ThunderClan leader his life. Later, during a forest fire, he trapped Squirrelflight’s kits—Hollyleaf, Lionblaze, and Jayfeather—on a ledge, intending to kill them to make her suffer. When she revealed they were not her biological kits, he vowed to expose her secret at a Gathering. To silence him, Hollyleaf murdered him and hid his body in a stream. Surprisingly, he was initially accepted into StarClan, with the explanation that his only flaw was "loving too much." However, this was later revealed to be a ruse. From the afterlife, he cut off the connection between StarClan and the living Clans, manipulated the medicine cat apprentice Shadowsight, and possessed Bramblestar’s body. As "the Imposter," he seized control of ThunderClan, enforced a tyrannical version of the warrior code, and exiled anyone he deemed a "codebreaker." His ultimate goal was to destroy the living world, StarClan, and the Dark Forest so that he could possess Squirrelflight forever. He kidnapped her into the Dark Forest and used mind-controlled spirits to build an army. His reign of terror ended when the warrior Bristlefrost sacrificed herself to tackle him into the dark, erasing both of their spirits from existence permanently. His legacy left the Clans in a state of trauma, leading to a massive reformation of the Warrior Code to prevent such abuses of power from happening again.