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Arturo Santiago (or just simply Dr. Santiago) is a minor character in The Loud House, and he is the father of Bobby and Ronnie Anne and the ex-husband; of Maria Santiago. He was first mentioned in "A Tale of Two Tables".
He's a Latin-American man with black shaggy hair, a mustache, and a beard. He wears a light green t-shirt, a stethoscope, blue jeans, white socks with orange horizontal stripes, and red shoes.