Ankhsar Khatun, called the Eagle, is the main villain of the Iki Island expansion. She is a shaman who leads the Eagle Tribe and uses a mind-bending poison she calls sacred medicine to break the people of Iki. She forces it on Jin early, and he fights her hallucinations as well as her army.
The Eagle is a commander and a spiritual leader whose followers obey every word. Her medicine makes people see visions, and she uses it as a weapon to make Iki submit. On Jin it digs up memories of his father's campaign on the island, and she uses those visions to question him.
As a young raider medic, her remedies drove some injured raiders mad, and her own people pushed her away. She lost an eye fighting the samurai during the Sakai invasion. After surviving a flood during a battle, she left Iki for the Mongol Empire and came back at the head of the Eagle Tribe.
Your final fight with her is in The Blessing of Death, at the gorge where Jin's father died. Bring the Sarugami Armor and consider the Mizu-no-Kami Charm from Marsh Rock Shrine, which helps you land perfect dodges and parries.
Jin learns to resist the medicine, which surprises her. In their last battle she tries to push him into killing Tenzo in revenge for his father. Jin forgives Tenzo instead and kills the Eagle, ending her hold on Iki.
Tenzo
Tenzo is a raider on Iki Island and right-hand man to the raider leader Fune. He rescues Jin after the Eagle poisons him and becomes his uneasy partner through the Iki Island story. His past with Clan Sakai runs deep.
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.
Black Hand Riku
Black Hand Riku is a blind former pirate captain who hides on Iki Island with his armour, the Sarugami Armor. You duel him at the end of the Iki Mythic Tale about his legend, and beating him earns you that armour.
Crimson Dye Merchant
The Crimson Dye Merchant, whose name is Sao, is an Iki Island vendor who sells red cosmetics for Flowers. Unlike the other dye merchants, you unlock him by winning the Hidden Cove Tournament at Fune's Refuge.