Daikoku is a Yarikawa archer who ignored orders to stay behind the walls. He led a band of archers against the Mongols in the countryside. In The Coward of Yarikawa, Jin frees his captured men and brings him back to defend the stronghold.
Jin, Yuna and Taka go looking for Yarikawa's best archers and find Daikoku's group. After the rescue they help set an ambush for the Mongols and then fight at the siege.
Image: Sucker Punch Productions / PlayStationJin Sakai
Jin Sakai is the samurai you play in Ghost of Tsushima and the Iki Island expansion. He is Lord Shimura's nephew and the last lord of Clan Sakai. After the Mongol landing he trades the samurai code for stealth and fear, and the people start calling him the Ghost.
Taka
Taka is Yuna's younger brother and a gifted blacksmith. Jin and Yuna rescue him from Azamo Bay, and he forges the grappling hook that gets Jin into Castle Kaneda. He is gentle and not much of a fighter, but he wants badly to help the Ghost.
Yuna
Yuna is a thief from Yarikawa and Jin's closest ally in Ghost of Tsushima. She pulls him off Komoda Beach, teaches him to fight from the shadows and coins the name Ghost. She also has her own four-part storyline, Yuna's Tales, about the slavers who stole her childhood.