James Heller's powers and abilities
Prior to his infection by Alex Mercer, Heller was competent and skilled in battle as a result of his military training, demonstrated in his slaying of a Brawler using only a combat knife. He is proficient with the majority of military weapons, ranging from standard assault rifles and light machine guns to miniguns rocket launchers. The abilities granted by his viral infection are divided into 5 categories - Offensive, Defensive, Locomotion, Predator and Power-Specialist.
Physical Prowess
As he was infected with the same DX-1118 strain as Alex, he has much the of same superhuman and shapeshifting powers, as well as others that he has evolved himself.
Heller's Blade
Shapeshifting: Heller's Blacklight infection has granted him the ability to shapeshift, allowing him to alter his appearance and fashion his body into weapons, much like Alex Mercer, but with some differences in appearance. An example would be the resemblance of his Blade to a giant combat knife and his viral flesh possessing a more reddish hue. His Whipfist has small razor-like blades across its spine-like form. Heller's evolved Hammerfists allow him to perform area attacks. Unlike Alex Mercer, James doesn't possess the Musclemass power, instead gaining the Tendril power. Also unlike Mercer, Heller's Shield power evolved so as to produce two shields simultaneously that protect him from multiple angles. He can also use this ability to perfectly mimic the form of last entity he just consume up to smallest details, including their vocal cord, to either blending in among civilians, infiltrating areas with heavier security, and even turning Military forces against each other (see Disguise and Patsy for more information).
Consume: As with Alex Mercer, Hames can absorb the biomass and DNA or essence of other entities, copying and assimilating it into his own in order to gain the entity's genetic memories and physical presence.
Critical Mass: Upon consuming enough biomass, Heller attains a state in which his durability increases since the excess biomass resulted his body to become more robust than usual like Mercer. The benefits of this state are the access for Devastator techniques and adrenaline surge which temporarily render him invulnerable to further injuries while severely injured which allows him to either flee or consume more organic matter to properly heal in addition of enough strength for executing a single devastator attack.
Memory Assimilation: As with Mercer, Heller gains the access to all the memories and skill individuals he assimilated as well as learns skills they had in addition of improving his own such as weaponry, vehicle usage, and even military tactics and plans. This ability comes with Web of Intrigue, which allows him to review vital memories of his victims.
Superhuman Speed & Agility: He possesses the same inhuman agility, speed, dexterity, and gliding (via biomass ejection and manipulation) 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 stamina and regenerative abilities, allowing him to heal within moments from any wound and to withstand intense damage that kill normal humans many times over without fatality.
Elemental Resistance: Heller's altered physiology endowed him superior resistance to fire and electricity than prior to his infection in the same vein with Mercer.
Superhuman Senses: Heller's senses are enhanced to far higher levels than those of the normal human. Instead of vision powers, however, he developed a viral sonar sense.
Hunting: 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 virally-enhanced Marines and dismembering infected creatures.
Evolutionary Adaptability: Due to the Blacklight Virus' ability to constantly evolve based on the situation and the information presented in consumed biomass, James can adapt to almost any situations just like Mercer does. In fact, he developed some powers unique to him as he gain strength to match Mercer such as Biobomb and Koenig visibly disturbed by Heller's transformation into a Prototype instead of evolved.
Indomitable Will: James Heller has incredible willpower which, coupled with his resilient DNA, allows him to retain his sense of self upon becoming a Prototype like Mercer and gain the same powers and abilities as the latter. He displayed great determination to avenge his family's deaths and later, saving his surviving daughter; using his pack ability to control a group of Juggernauts at one point, and willing his Blacklight Virus-enhanced body resisting Mercer's influence over it.
Infection Powers
Main article: Biobomb
Heller can manipulate the Blacklight virus for his own advantage in the form of a Biobomb. He is able to implant his targets with a special strain of virus, 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 at the epicenter. Heller can also hurl victims after implanting them with a Biobomb, activating the ability on impact and destroying everything within range.
Offensive Powers
Main article: 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 blunt weapons.
Defensive Powers
Main article: Defensive Powers
Heller can use two defensive powers, guarding him against enemy attacks and weapons, much like Alex, though he is capable of producing two shields whereas Alex could only produce one.