Preferring to go by his middle name, Diego is a gambler and poker player originally from northern London. He's cocky and a wiseass and has a tendency to speak before he thinks. He can be a big flirt, preferring men to women but acknowledging both, but leans toward insecurities in both platonic and romantic relationships. He's been betrayed by friends and lovers alike and doesn't trust easily, but gives all of himself to his friends.

Diego speaks with a heavy Cockney accent and has a surprisingly deep voice for a man of his build. Primarily found at the poker table, he scorns others who attempt to hide behind sunglasses and hats/hoodies and prefers to play the people rather than the cards. A set of initials are carved onto the poker chip he wears round his neck, but when questioned about them, he jokes and deflects. Despite his insecurities with himself, Diego has a positive outlook overall with an occasional cynical streak and prefers to laugh and joke in uncomfortable situations.