Thornclaw/Main article

Thornclaw is a golden-brown tabby tom.

He is born to Frostfur and Lionheart along with his littermates, and is abducted by Clawface of ShadowClan along with his siblings until they are rescued by a patrol consisting of ThunderClan cats and ShadowClan elders. He then becomes an apprentice to Mousefur, taking on the name of Thornpaw, and trains under her for many moons. He and Cloudtail are deeply saddened when Thornpaw's sister, Brightpaw, is scarred by the pack and tries to console his sister as often as possible. He and Brightpaw, now named Lostface by Bluestar, become official warriors under Firestar, Thornpaw becoming the very first cat Firestar names a warrior, Thornclaw. Later on, Thornclaw gains an apprentice, Sootpaw, who becomes Sootfur. He also gains a second apprentice, Shrewpaw, but he is killed after trying to catch a pheasant that would have 'fed half the clan' according to Thornclaw, leaving the mentor devastated. Thornclaw eventually partakes in the Great Journey and befriends many other Clan cats, but stays loyal to ThunderClan and also takes part in the battle as one of Onewhisker's loyalists during Mudclaw's rebellion.

Thornclaw becomes the mentor to Poppypaw, his niece via Brackenfur, and also becomes the mentor to Briarpaw when Poppypaw becomes a warrior. Briarpaw ultimately has her spine crushed by a falling tree, hindering her unable to become a proper warrior, saddening Thornclaw, but he is happy when she gains a warrior name; Briarlight. Thornclaw eventually makes his way up to one of the most senior warriors in ThunderClan, and is recruited by the Place of No Stars to fight for them in an upcoming battle, among many other cats, although Thornclaw is unaware of this fact. He fights for the Clans during the Great Battle, whereas he survives and continues on as a senior warrior and is forgiven by the rest of his Clanmates. He becomes mates with Blossomfall, also a former Dark Forest trainee, who bears his kits, Eaglepaw, Plumpaw, Shellpaw and Stempaw.