The "son of none" was a member of the House of T'Kuvma who took the mantle of Torchbearer after Rejac's death and later became T'Kuvma's successor following the Klingon leader's death at the Battle of the Binary Stars. Voq spent six months repairing the Sarcophagus ship after its initial battle only to have the ship taken by Kol and being left to die on the deserted U.S.S. Shenzhou. He was later rescued by L'Rell and taken to the home of the Mókai where he was transformed into a human, Ash Tyler, to become an undercover spy aboard the U.S.S. Discovery.
In the mirror universe, Michael Burnham discovered Voq to be Fire Wolf, leader of the rebel forces against the Terran Empire.