He is voiced by Aaron Phillips.
Personality and background
His parents are WASPs with a habit of giving their children awkward and pretentious names - he says he got lucky, as his sister is named Muffy. He has a wife who accuses him of cheating, something that greatly upsets and angers him - while he is having affairs, he views it as a matter of trust as his wife incorrectly suspects that his golfing is a cover for infidelity when in fact it is genuine.
Events of GTA V
Castro is first encountered by the player having an argument with his wife at his home; she accuses him of using his late-night golfing trips as a cover for an affair, and throws a bag of his personal possessions onto the driveway. He will then notice the protagonist, and request a ride to the golf course. If delivered successfully, he will give the player a small financial reward and the ability to play him in golf. He is "Hard" difficulty.