He is known to be a non-skilled golfer, and uses Nate as his caddy, often requesting him to fish out his played golf-balls, and occasionally his club as well, from the course's ponds and frequently embarrassing them both in front of other people, who usually are hit by Marty's golf balls.
He is renowned throughout Nate's town for giving out inappropriate Halloween "treats" (according to the trick-or-treaters) such as rice cakes, vegetables and prunes (apart from one year when he forgot to purchase any candy at all) and cooking terrible food (According to Nate, every year's Thanksgiving dinner always sets off the smoke alarm).
Whenever his children, Ellen and Nate, request him to buy a pet (a cat for Ellen and a dog for Nate) he always refuses. One time, his dad found a cat under their porch and took her in until someone claimed the cat.
He once chaperoned on Nate's Timber Scouts camping trip, but ended up ruining the experience for everyone after being sprayed by a skunk because he scared it. According to Nate, everyone smelled of skunk for a whole day.
He was the assistant coach for Nate's baseball team at one point, which for some reason always has some humiliating names from humiliating sponsors which surprisingly, isn't because of Marty himself.
At an unknown time and occasion, Marty married an unidentified woman, only for them to divorce at least twelve years after. However, this did not happen before the two gave birth to Ellen and Nate. Marty tried to be a good parent to his children, although one part of Nate really doesn't like him. On Halloween, he made a habit of handing out undesirable treats such as prunes and tofu, leading to his house becoming "egged" for his actions. Because of this, his house also has a target painted on it.
Golf is Marty's favorite sport, even though he isn't remarkably good at it. He always forces Nate to caddy him. Marty also gets very frustrated, even biting and bending his three-wood with his bare teeth. Marty did the same to his Iron 7. He also sometimes gets lost, even once ending up in a man's backyard in a separate town.
He aim isn't very good either, hitting golf balls into places like water hazards, forests, and parking lots. He is also known to hit the ball towards the wrong hole, at an elderly woman, or at other fellow golfers. At one point, he hit the head of a groom at a wedding. He hit another ball into a couple's backyard and the couple had no idea that there was a nearby golf course (probably because there wasn't one).
Once, Marty went golfing with Donald Eustis. While on the green, he missed a putt, where the ball was only a few inches away from the hole. It resulted with Marty bending his putter with his teeth.
Another time, Marty hit the ball to another fairway. Two other golfers asked him which tee he was at, and he replied the "13th". The other guys laughed and told Marty that the course had only nine-holes. Marty is not very accurate.
Marty's weight always has been a problem for him, yet he never sticks to a diet with his constant craving for junk food, always stealing off of Nate's stash without permission when he can't get any himself. At one point, it took him a huge effort just to get his weight under 185 lbs.
Personality and traits
Ever since his divorce, Marty has become desperate for love. He always sticks to his ways despite his children's constant efforts to change him and how other people ridicule and reject him. Marty likes handing out healthy foods on Halloween because he doesn't want to contribute to the American obesity epidemic, yet he always keeps all the junk food to himself.
Nate knows that his dad buys several Pop-tarts from the vending machine at his work every day, has a huge secret stash of gummi-worms, and puts four sugars in his morning coffee.