Nothing is known of Yago's background.
Yago is encountered in The Gunslinger's Tragedy in which he holds the wagon driver Fermin Ichinaga, Yago is killed or hogiet due the player's choice in an attempt to get the wagon back. However despite this, he can most often be found around Chuparosa, frequently loitering inside the cantina. He can be found playing Liar's Dice in Casa Madrugada. He can also be encountered at the Tesoro Azul gang hideout inMultiplayer, and in the Fort Mercer gang hideout in single player, where he will be hostile unless the player is wearing the Bandito Outfit.
- His character model is available in the Outfitter under the name Antonio Xavier.
- Yago, Arcadio Gamboa and Rafael Jaspeado are the only banditos that do not appear as a bounty target.
- He appears to have a whiskey or tequilla bottle tucked into his front pocket.
- In the Tesoro Azul multiplayer hideout, he will throw Throwing Knives with frightening accuracy.