Ramirez is a young initiate who was born after the Great War, commenting that the post-War world is the only one he has ever known. He and his parents arrived with the Settlers at Foundation, but he left home to join the Brotherhood after they set up base at Fort Atlas. He has a friendship with Marcia Leone and she respects him.
↑Vault Dweller: "Tell me more about you." Initiate Ramirez: "Not much to say, really. I was born after the bombs fell, so this world is all I've ever known. My parents and I came to Foundation to start a new, more secure life. I lived there until the Brotherhood of Steel came." (Luis Ramirez's dialogue)