The Yiga Clan (イーガ団, Yiga Team) is a Sheikah clan of assassins in The Legend of Zelda: Breath of the Wild.
Led by Master Kohga, the Yiga Clan is a group of assassins who steal information and resources from the Gerudo tribe. Unlike other Sheikah, they sided with Calamity Ganon and try to hunt down the hero. It mainly consists of Yiga Footsoldiers and Yiga Blademasters. Some members even disguise themselves as travelers, who try to get the attention of Link; they usually walk around the roads of Hyrule and wave to get Link's attention, but some members also try to fake cry and others appear out of thin air to ambush Link. If Link talks to one of them, the try to sell Link food based items or try starting up a conversation with him. If Link refuses to talk or buy, or when Link actually buys what the person is selling, they will reveal themselves and confront Link with their weaponry. The clan's crest is an upside-down Sheikah crest. The clan is obsessed with Mighty Bananas and if any member sees any, they will get distracted by them and stop fighting Link; they will also drop Mighty Bananas, along with Rupees, when defeated.
As a costume
The Yiga Footsoldiers serve as the inspiration for a Mii Swordfighter costume in Super Smash Bros. Ultimate. The design of their sword is based of off the Vicious Sickle, a weapon in Breath of the Wild that the Yiga Footsoldiers may have.