Graystripe/Main article

Graystripe is a big, sturdy, solid dark gray tom with a stripe of darker gray fur running down his back, a torn left ear, and yellow eyes. He has shaggy fur, a thick, bushy tail, and a broad face.

He is first seen as a young ThunderClan apprentice named Graypaw, who ambushes Rusty when he curiously wanders into the forest. They immediately begin forming a friendship after their skirmish ends. When Rusty is accepted into ThunderClan as an apprentice, he and Graypaw and Ravenpaw begin their warrior training as friends. They do everything together until Ravenpaw reveals to his friends that his mentor, Tigerclaw, murdered the ThunderClan deputy, Redtail, in battle. Tigerclaw finds out that Ravenpaw knows his secret and threatens to kill him to keep the apprentice quiet. Terrified for Ravenpaw's life, Graypaw and Firepaw help their friend escape from ThunderClan in secret and bring him to live with the loner, Barley. They tell their Clan that Ravenpaw was dead so that Tigerclaw would not look for him.

After bravely fighting ShadowClan, Graypaw receives his warrior name of Graystripe alongside his best friend, Fireheart. Fireheart and Graystripe do several brave things as young warriors that were traditionally against the warrior code, such as feeding RiverClan when they were starving due to their fish being poisoned. They also bring WindClan home after Brokenstar drives them away to steal their territory. Graystripe is given his first apprentice, Brackenpaw.

When Graystripe falls in the river chasing his prey, he is rescued by the beautiful RiverClan warrior Silverstream. He wants to see her again and pursues a relationship with her. He and Silverstream meet for many moons in secret, with Fireheart being the only cat knowing of their forbidden love. Fireheart disapproves of their relationship and tries to talk sense into Graystripe, but the gray warrior refuses to listen. Graystripe neglects his apprentice, Brackenpaw, and often misses their training sessions. Fireheart takes Brackenpaw on as his unofficial apprentice. It is later revealed that Silverstream is expecting Graystripe's kits, and she bores them in secret at Sunningrocks. Tigerclaw, Fireheart, and Cinderpaw scent blood and find her and Graystripe there. All of the cats are shocked, but Cinderpaw helps Silverstream deliver two kits. However, Silverstream dies of blood loss and Graystripe is absolutely devastated. He buries his mate by the river and mourns her loss for many, many moons.

He brings his two kits to ThunderClan and Goldenflower nurses them. RiverClan wants the kits and the deputy Leopardfur claims her Clan is willing to fight ThunderClan for them. To avoid a battle, Graystripe brings Stormkit and Featherkit to RiverClan and decides to stay with them since they are the only living connections he has to Silverstream. Fireheart is heartbroken at his decision and wonders if he'll be able to maintain his relationship with Graystripe.

Graystripe tries to come back to ThunderClan after realizing where his loyalties truly lie but Bluestar refuses harshly, doubting his loyalty. When RiverClan fights ThunderClan for Sunningrocks, Leopardstar commands Graystripe to attack his friend Fireheart, and he refuses. After the battle she exiles him and Bluestar accepts him, claiming that her Clan is already full of traitors.

He becomes deputy after Firestar's first deputy, Whitestorm, dies in the battle against BloodClan. In this battle, he also kills the traitor Darkstripe. He leads the Clan while Firestar and Sandstorm are gone on their journey to find SkyClan.

Graystripe leads an attack on the construction Twolegs alongside Squirrelpaw to free all of the cats who had been trapped, including Leafpaw. He manages to help open several cages before he is snatched up by the Twolegs. His Clanmates last see him staring out the back window of a monster as it drives away. Firestar grieves heavily for the loss of his friend and deputy, and refuses to believe he is dead. He does not appoint a new deputy for many moons.

Graystripe finds his way to the Clans in their new territories along with his new mate, Millie. He helps train her to be a ThunderClan warrior. Firestar asks Leafpool to visit to Moonpool to ask StarClan whether Graystripe should become deputy once more, or if he should leave Brambleclaw as deputy. StarClan approves of Brambleclaw remaining deputy. Firestar brings the Clan together and annouces that Graystripe will not be deputy again, and allows Brambleclaw to resume his duties. Millie later gives birth to their kits, Bumblekit, Briarkit, and Blossomkit. He proudly and affectionately raises his kits along with his mate. He is devastated when Briarpaw breaks her spine trying to save Longtail from the tree that falls into the hollow and helps care for her. When a patrol of cats visits Tribe of Rushing Water, it is revealed that Graystripe is the grandfather of Lark That Sings at Dawn and Pine That Clings to Rock. He takes part in the Great Battle, and is devastated when Firestar dies. He and Sandstorm later retire as elders together.

Millie joins him in the elder's den some time later. Graystripe becomes the grandfather to Stemleaf, Eaglewing, Plumstone and Shellfur, the kits of Blossomfall. He and Millie grieve for Briarlight when she dies due to sickness.