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

He is from Khaeri'ah, serving as a Sentiel Knight there, the Commadner. After the war with Abyss in Khaenri'ah, he was able to survive and became cursed with immortality as with all other pure-blooded Khaenri'ahns, eventually joining the Fatui as The Captain, the First of the Fatui Harbingers.

Being the First of the Fatui Harbingers, Capitano had powers rivaling that of a god. However, by the time the Traveler met him, he was in a weakened state due to the curse of immortality causing his body to decay due erosion.

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

After fusing with the Lord of the Night, Capitano's body remains dormant on the Throne of the Primal Fire atop 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 due erosion. 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 enjoyed a high reputation amongst the Fatui for his strength, skill as a commander, and moral integrity. whenever he indulged in his sense of honor, it would result in him losing his chance to win. But he follows every rule of soldier codax and is high moral. Capitano is most commonly typed as INTJ (Introverted, Intuitive, Thinking, Judging). This suggests II Capitano is Mastermind visionary, Future architect, Fiercely independent and Determined & strategic.