Arturo is a local resident of Diamond City. He is a seasoned gun enthusiast, making a living as a weapons dealer in the city's local market place. He runs a weapons store called Commonwealth Weaponry. Arturo is the father of Nina Rodriguez, a child who is educated at the Diamond City schoolhouse. Her room, with her toys and study desk, can be found in her dad's house, behind his shop.
As a local of Diamond City, Arturo knows the residents in town, notably Nick Valentine, a synth and private detective. He sells the Big Boy, a custom two-shot Fat Man, and a custom laser pistol Old Faithful, that deals double damage to targets with full health. He also sells power armor frames and common weapon essentials such as ammo, mods and crafting materials.
If the player character has Deacon as a companion, he may strike up a conversation with Arturo filled with cryptic phrases and code words, indicating he may be a member of, or at least an informant for the Railroad.