Jak and Daxter

Jak is the main protagonist and titular player character of the Jak and Daxter series, accompanied by his sidekick, Daxter. He is a human male with green-blond hair, cerulean blue eyes, and fair skin. A brave yet troubled hero chosen by the Precursors, Jak's unique skills, particularly his mastery of eco, have allowed him to save the world from several existential threats.

Jak was raised in Sandover Village by Samos Hagai, and when his best friend, Daxter, was transformed into an ottsel, the duo went on their first adventure, supported by Samos and Keira. Their next saw the four travel to Haven City, where dark eco experiments changed Jak. Though Jak's fearlessness, drive for adventure, and candid nature remained his core traits, where his candidness once presented as him being mute, it instead manifested in a stoic attitude and short temper. Jak's traits contrast with Daxter's cowardice and jovial nature, though their supportive friendship has been vital. Often beginning adventures with selfish motivations, through his war with the Metal Heads and Dark Makers, Jak ultimately fulfiled the Precursors' destiny, being the hero the world needs.

Jak's ability to channel eco is his most noteworthy and unique ability. He begins with the ability to channel the four basic eco types (green, blue, red, and yellow), but after the experiments can transform into Dark Jak for more monstrous powers, and later into Light Jak. Jak's signature weapon is his Morph Gun, which uses eco-based ammunition for different gun types. Beyond this, Jak has extensive vehicular skills, particularly with zoomers and buggies, and is a notably skilled racer. Jak was born to Damas and an unknown mother, and named Mar (after the founder of Haven City) at birth. With his eco powers, Jak was the heir to Mar's legacy, and believed to be the Chosen One. He was also the rightful heir to the throne of Haven City, and Baron Praxis, who had usurped the throne from Damas, kept his war with the Metal Heads going to stay in power and ensure city's need for, in Praxis' words, "a strong leader, not a childish fool".

Count Veger, chairman of the Grand Council of Haven City, kidnapped Jak to harness his powers for experiments Veger later lost Jak to the Underground as its leader, Samos, found him wandering the streets and recognized him for his amulet. Praxis launched a concerted effort to find the child, sending his top lieutenant Erol after him, and rounding up every child in the city.

The Underground kept Jak hoping both that he could be placed on the throne to depose Praxis, and in the hopes he could open the Tomb of Mar to find the Precursor Stone. Kor, the leader of the Metal Heads who joined the Underground ranks through a human disguise, kept close watch of Jak, secretly wanting Jak to awaken the Precursor Stone for his benefit; only Mar's true heir could, and it would allow for Kor to "feed on the last Precursor life force". Meanwhile, as Damas ruled Spargus in his banishment from Haven, Damas hoped to one day find Jak again, keeping an amulet identical to Jak's, and preserving Mar's armor for when they met again. While channeling Dark Jak, Jak's skin complexion becomes a light gray with a slight purple or blue tint, his hair grows slightly longer, shaggier and spikier, and becomes a darker gray, with his goatee looking somewhat darker, and his eyes grow completely black. He also grows large, black claws, and during Jak II grows a pair of large, black horns, which do not appear in Jak 3. This is presumably due to the balancing effect of light eco, though the horns later reappeared in the beginning of The Lost Frontier. Additionally, sharp, brief purple bolts can be seen spewing from his body at random intervals (which can affect others around him especially whenever he attacks with melee moves), and he can be seen with a very aggressive posture, with his claws open and heavy breathing patterns, with a hostile and somewhat feral facial expression and behavior.