Bataar is the Mongol general behind the attack on Komatsu Forge. Jin and Yuna fight him while defending the forge in Hammer and Forge.
He leads the Mongols at Komatsu Forge while Taka works on the grappling hook. Beating his force is what makes Yuna announce that Jin is a ghost.
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.