Tigerstar is a big, dark brown tabby tom with unusually long front claws, and amber eyes.

Tigerstar was a Shadowclan leader in the forest territories, formerly the Thunderclan deputy under Bluestar, who was exiled for his attempted murder of his leader. Tigerkit was born to Pinestar and Leaopardfoot alongside his sisters, Nightkit and Mistkit, who both died after birth. Tigerpaw was apprenticed to Thisleclaw, who nurtured his ambition, and after becoming a warrior, Tigerclaw yearned for leadership. He became the mentor of Darkstripe, and during a battle over Sunningrocks, Tigerclaw murdered Redtail, the clan deputy, in hopes of receiving his position, though the act was witnessed by his apprentice, Ravenpaw. Following Lionheart's death, Tigerclaw achieved becoming deputy. He and his mate, Goldenflower, had two kits, Bramblekit and Tawnykit.