Il Capitano, also known as Thrain and by his codename "The Captain,"was the First of the Eleven Fatui Harbingers.

Initially opposing Mavuika's plans to save Natlan, Capitano later offered his support to her efforts to defeat the Abyss. Following Gosoythoth's defeat at the hands of Mavuika and the Traveler, Capitano sacrificed his life force to the Lord of the Night in place of Mavuika, making use of the curse of immortality placed upon him and all Khaenri'ahns by Ronova to supply the Lord of the Night eternal life to repair Natlan's Ley Lines.

Without his life force, Capitano's body remains dormant on the Throne of the Primal Fire a top Ochkanatlan.

Capitano is a tall man with a rather large build. He has glowing dark blue eyes and long black hair that protrudes from the back of his helmet and over his shoulders. His helmet obscures his face, which he mentions is in a state of "decay" and disfigurement. While Capitano reveals his face to the Traveler and Paimon to show the suffering that the Ruler of Death inflicted on them (surprising both), it is obscured from the player. He wears a typical Snezhnayan winter coat, which he takes off during battle. Underneath the coat, he wears a black bodysuit with golden chains and accessories. Capitano also wears a pair of clawed gauntlets.

Capitano originally hailed from Khaenri'ah where he served as a Commander. Similarly to Pierro, he was aware of Dainsleif and the Traveler's Sibling, having seen the two together as the last time he saw Dainsleif. When the cataclysm hit Khaenri'ah, Capitano watched as his nation, family, and allies fell to the Abyss, deeply scarring him. After putting up some resistance, he realized that the situation in Khaenri'ah was unsalvageable and fled with the remnants of his platoon to Natlan. At the time, many people viewed those from Khaenri'ah with suspicion due to believing they were responsible for the disaster, though he befriended the chief of the Masters of the Night-Wind at the time, Ayizu, who treated him with respect. The two fought countless battles against the Abyss, but Ayizu eventually died. Before his death, he told Capitano about the secret of the Pyro Gnosis, which caused him to resent Mavuika for not fulfilling her oath and prolonging the inevitable. Capitano's heart was also modified to convert memories and souls into knowledge from the Ley Lines, and throughout his journeys, he would absorb countless souls which he hoped to release into the Ley Lines to grant them peace.

He was able to survive and became cursed with immortality as with all other pure-blooded Khaenri'ahns, eventually joining the Fatui as the First of the Fatui Harbingers.

Following the death of fellow Harbinger Crucabena, Capitano was in attendance along with Scaramouche and Signora as Pierro appointed Arlecchino as Crucabena's replacement.

After Signora's death at the hands of the Raiden Shogun, a funeral for her was held in Snezhnaya. Capitano, along with the other Harbingers barring Scaramouche, was in attendance, where he questioned Il Dottore on the situation with Scaramouche and the Electro Gnosis.