Colton Haynes as Jackson Whittemore -Kanima/Werewolf-
Jackson Whittemore is the former co-captain, of the Beacon Hills lacrosse team and the former captain of the school’s swim team. Jackson’s birth parents were Gordon and Margaret Miller. They died in a car crash on June 14, 1995, but Margaret was kept on life support long enough for the doctors to deliver Jackson by c-section into the middle of the night as his birthday is June 15th. He was adopted by attorney David Whittemore and his wife. In compensation for their deaths, Jackson is to receive a large insurance settlement on his eighteenth birthday.
Jackson is the big man on campus at Beacon Hills High, and has a competitive, selfish and aggressive nature, which shows through hostility towards people who best him. The show implies that he wants to make others proud of him and this desire to always be the best appears to stem from his insecurity about his adoption and the fact that he does not know his real parents, leading him to be unable to see his adoptive parents as his true mother and father. Despite his abrasive character, he is shown to care for his friends and dislikes hurting them. It turns out he is genuine friends with Danny Mahealani and he actually cares more for Lydia Martin than he lets on, though he’d never admit it. During Season 1, Jackson is angered and suspicious by Scott McCall’s sudden, seemingly impossible improvement on the lacrosse field and other activities repeatedly besting him. Consequently, he investigates Scott, eventually coming in contact with Derek Hale and being accidentally scratched by Derek in “Magic Bullet” (who was poisoned with wolfs bane at the time and partially passes the poisoning onto Jackson through the claws), witnessing the Alpha werewolf in “Night School” and eventually discovers Scott is a werewolf. He threatens to expose Scott unless he helps him become a werewolf too. The Argents grew suspicious of Jackson. At the school formal he gets drunk and exposes Scott’s werewolf nature to them. In the Season 1 finale, “Code Breaker”, he regretted turning Scott over to the Argents, and helps Scott, Allison and Stiles defeat the Alpha werewolf, Peter Hale. Later Jackson appears the Hale house demanding the Bite from Derek because he helped him.
In the Season 2 premiere “Omega”, it’s revealed Derek had Bitten Jackson, which he takes with absolute pride. However, Derek notices his body is rejecting the transformation, causing black blood to bleed out of his orifices. In the fifth episode of Season 2 “Venomous” its revealed Jackson instead became a Kanima, a murderous reptilian shapeshifter that is a weapon of vengeance. Jackson, as the Kanima, commits numerous murders throughout Season 2. Jackson does not know that he is the Kanima, nor does the Kanima side of him know that it is Jackson. In his Kanima form, Jackson was nigh unstoppable: he had enhanced strength and agility that far exceeded the werewolves, even Derek, the Alpha werewolf, the Kanima could heal from being shot by Chris repeatedly, Derek slashing its throat, and Allison putting an arrow in its head and stabbing it in the chest. The Kanima’s claws also produced a paralytic poison that could completely immobilize a victim by the Kanima slashing the back of the neck and it could scale walls. The Kanima seeks a Master who wishes to exact revenge on others to control the shapeshifter and the Kanima carries out whatever vengeance the Master bids, revealing that as the Kanima, Jackson’s every move is controlled by someone else. In the episode “Fury”, it’s revealed Jackson came across an unstable, traumatized student, Matt Daehler who became his Master. Matt had the Kanima murder former Beacon Hills High students who almost caused him to drown when he was a little boy during a drunken pool party. After Gerard Argent kills Matt, he becomes Jackson’s new Master. It is revealed that Jackson became the Kanima because he is an orphan, exemplified by his outward behavior and personality, meaning he lacks an identity. He can be saved by a person with whom he shared a true bond; in Jackson’s case, this person is Lydia. Through Lydia’s selflessness in the Season 2 finale, “Master Plan”, the Kanima reverts to Jackson. Aware of what he is, Jackson then allows Derek and Peter Hale to kill him. Dying, he asks Lydia does she still love him, she responds that she does. Jackson then comes back to life and finally becomes a werewolf, however, with blue eyes rather than the common yellow. His eyes as a werewolf are blue, because as the Kanima he took innocent lives (regardless of his intent) ; Derek, Peter, and the twins Ethan and Aiden share this feature.