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James Heller was a Sergeant in the Marines Corps before his infection. He lived in Manhattan, New York with his wife Collette and daughter Amaya. After the war, Heller wanted to return home and live with his family while maintaining a small business in the city. He had to return after his leave was complete. During this time, there was a viral outbreak in the city, resulting in death of thousands.
SECOND OUTBREAKedit
"If they got the situation contained, then there is no reason to doubt them?"
―Heller trying to comfort his wife

Heller's deep sorrow marked by his wife's death.
Heller received a call from his wife, who informed him about the outbreak and told him that Blackwatch had quarantined the area. Heller assured them that he would return the next day. But when returned to the city, he discovered that the Blacklight infection had ravaged all of Manhattan and his family had been killed.
When Blackwatch claimed that a former scientist named Alex Mercer was responsible for the outbreak and was spotted in the Red Zone, Heller volunteered for patrols in the infected Red Zone, hoping for a chance to find Mercer and avenge his family.

POWERS & ABILITIES
Prior to his infection by Alex Mercer, Heller was competent and skilled in battle as a result of his military training, as he was reported to have killed "hundreds" of infected before his own infection. He is proficient with the majority of military weapons, ranging from standard machine guns, rapid-fire Gatling guns, and rocket launchers. The abilities granted by his viral infection are divided into 5 categories - Offensive, Defensive, Locomotion, Sensory/Hunting, and Disguise.
PHYSICAL PROWESS
As he was infected with the same DX-1118 strain as Alex, he has much the same superhuman and shapeshifting powers, as well as many more that he has evolved and/or developed himself.
Shapeshifting: Heller's Blacklight infection has granted him the ability to both shapeshift and fashion his body into weapons, much like Alex Mercer, but with some differences in appearance. An example this would be his Blade resembling a giant combat knife and his viral flesh possessing a redish hue.
His Whipfist has small razor-like blades across its spine-like form. Heller's evolved Hammerfists allow him to perform area attacks. He possesses the same consumption/assimilation abilities inherent in all infected creatures that allow him to take on the form and memories of any creature he consumes. Unlike Alex Mercer, James Heller doesn't possess the Musclemass power, instead gaining the Tendril power.
Speed & Agility: He possesses the same inhuman agility, speed, dexterity, and gliding abilities as Alex, allowing him to jump to great heights, outrun vehicles, run up walls, and perform parkour maneuvers not possible to those with normal physiology.
Endurance & Healing Factor: Heller is equal to Alex in his stamina and regenerative abilities, allowing him to heal within moments from any wound and to withstand intense damage without fatality.
Superhuman Sense: Heller has developed a mysterious yet potent viral sonar sense. This sixth sense allows him to find a target in a crowded populated area.
Superhuman Strength: Due to his inhuman strength, Heller is capable of lifting vehicles, dismantling weapons from armored vehicles, overpowering scientifically-enhanced Marines and dismembering mutated creatures.
INFECTION POWERS
Biobomb
Heller has manipulated the Blacklight virus for his own advantage. He is able to implant his targets with a Biobomb, which mutates the target's body rapidly, eventually ending with a barrage of tendrils erupting from the infected body which impale and pull objects within range to the victim's epicenter. Heller can also hurl victims after implanting them with a Biobomb, activating the ability on impact and destroying everything within range.
OFFENSIVE POWERS
Heller can form his biomass into a variety of weapons, mostly slicing or crushing tools. In combat, he either uses biomass to augment his strength or create various blades and clubs.
DEFENSIVE POWERS
Heller can use two defensive powers, guarding him against enemy attacks and weapons.