Martin is the son of Harry Flynn the Secondary Antagonist of Uncharted 2 Among Thieves he's a Fortune Seeker and Treasure Hunter, plus student at Game High. And he's trying to fix his father's relationship with Nathan Drake by befriending his son Patrick and pledging himself to be a better friend than his father.
Martin is a easy-going and relaxed person, often speaking with British terms such as "mate" or "love". However, he is shown to be very bad-tempered, intelligent, strategic, he's also a sarcastic individual who would often throw sarcastic and witty comments during difficult situations, but he rarely insult other people because of their traits. He's also shown to be loyal, skilled, charming, and a adept liar.
Martin is a tall man standing at 6 ft 2 inches, with a fair skin tone and muscular and thin body structure. he also has short brown hair which is swept back, with a strand hanging on his forehead. He also sports a casual outfit that consists of a grayish white T-shirt along with a pair of dirty blue jeans and reddish-brown shoes. Along with that, he wears a red necklace and two brown bracelets, one on each arm. while a handgun holster is located on his right leg.
Martin was the son of Harry Flynn and an unknown female museum curator.
Martin is single.