Marlin was a Havenite citizen and an enlisted soldier of the People's Marine Corps.

In 1903 PD, Marlin held the rank of Corporal and was assigned to PNS Saladin. He stayed onboard the vessel, when it was transfered to the Navy of Masada and renamed MNS Thunder of God. He was on guard outside Captain Alfredo Yu's office when the Masadans mutinied. He was ordered by Yu to find Major Bryan and inform him that Code: Bounty had been declared. He was wounded during the Havenite crew's flight to the boat bay. (HH2)