Other main cast members include Shane West as Michael, Lyndsy Fonseca as Alexandra "Alex" Udinov, Aaron Stanford as Seymour Birkhoff, Ashton Holmes as Thom, Tiffany Hines as Jaden, Devon Sawa as Owen Elliot, Noah Bean as Ryan Fletcher, Dillon Casey as Sean Pierce, with Melinda Clarke as Amanda Collins and Xander Berkeley as Percival "Percy" Rose.
[2] Portrayed by Maggie Q, Nikita Mears, the show's main protagonist, and titular character was a waif who never knew her parents and went from one foster home to another.
His father attempted to enroll him in military school, but upon discovering this, Lionel faked his own death under the guise of a drunken boating accident, thereafter changing his name to Seymour Birkhoff.
Percy is rumored to have built his entire operation around Amanda's methods and relies on her to get inside people's heads, both during torture and to break them down to believe in Division unconditionally.
Portrayed by Dillon Casey, Sean Mason Pierce is a Lieutenant Commander in the U.S. Navy and SEAL Team Six operator, with a considerable reputation and record.
Sean was originally dedicated to terminating Nikita and her team due to their actions endangering his mother, and to this end began seducing Alex as he was aware she was still connected to the rogue agent.
In Season 3, their relationship becomes strained when Sean sees Alex isn't distancing herself from Division, and her continued service was endangering her life.
Sean briefly left her, not wanting to witness another person he loved die due to their connection to Division, and it resulted in Alex going off the rails and relapsing into drug use.
In "Broken Home", Sean was involved in the mutiny at Division, and after a gunfight, succumbed to internal bleeding and died in Alex's arms.
Portrayed by Noah Bean, Ryan Thomas Fletcher is a CIA agent and analyst who is known in the agency as a conspiracy theorist regarding Division.
Initially, a junior analyst and case officer, when Owen Elliot releases information detailing the Division's assassination of a Chilean presidential candidate, Ryan reports his suspicions to his superiors.
He becomes Nikita's ally, agreeing to help track down the group of officials who sanction Division, and discreetly allows them to escape CIA custody from a plane en route to the United States.
Ryan, who at this time is romantically attracted to Nikita, feels betrayed when they capture Birkhoff and realizes that revenge is more important to her than his career.
In the Season 2 finale, Ryan is Nikita's anti-Division team's contact with the US government, liaising with the President himself on how to attack Division safely and in time to stop Percy's plans with his new satellite weapon.
Working alongside Nikita, they would undo Percy's damage, and reform it to combat threats to the country and give second chances to its members, as had been originally intended.
He is subsequently captured and eventually commits suicide by throwing himself out a window, knowing his death will force Nikita to realize that her crusade to stop MDK, and Amanda, is not yet over.
Portrayed by Devon Sawa, Owen is a former Division "cleaner" operative who resides in Montreal, Canada as a Guardian- one of the specially chosen few trusted to handle one of Percy's black boxes.
Owen continues working with Nikita through Season 2 when he disappears again to hunt down and kill the remaining Guardians and destroy their boxes.
In the third-season episode, "Masks," Owen is attacked by Amanda who paralyzes him and causes him to remember his true identity as Sam Matthews, a former Delta Force member.
He reveals that Sam was a corrupt soldier who was running a heroin smuggling operation but was betrayed by his fellow members who shot him, leaving him for dead.
Nikita can't believe Owen could be this way but he turns her over to Amanda, killing the woman's bodyguards in the process with a sociopathic attitude.
Jaden arrived at Division two months before Alex, having been recruited after murdering her boyfriend while he slept, an action Percy admiringly describes as "taking initiative".
In the Season 1 finale, Roan tries to "clean" Nikita's seemingly dead body, when she wakes up and splashed hydrofluoric acid meant for her in his face, leaving him scarred.
In the Season 2 finale, Roan, after receiving a signal telling him Percy is dead (where he looks momentarily somber; taking off his signature glasses as a simple sign of respect), moved to release plutonium in a public area in the U.S. Before he could, he battled Sean and Alex, and, by accident, electro-shocked himself to death.
Portrayed by Peter Outerbridge, Ari Tasarov is the leader of the Russian criminal organization Gogol, which seeks to rival and topple Division, and serves as the shadow arm of Sergei Semak.
Satisfied with the result, Tasarov meets with Nikita, offering to work with her to take down Division, also revealing his knowledge of the black boxes.
After Nikita hits a convoy full of heroin, Kasim goes to St. Petersburg to confront Tasarov about the identity of the "Knights of Shi'ra".
Ari grows impatient and threatens Owen when he cannot find the black box, doubting his ability to deliver on their business arrangement.
Portrayed by Peter J. Lucas, Sergei Semak is the current CEO of Zetrov and head of Gogol, following the death of Nikolai Udinov.
Portrayed by Lyndie Greenwood, Sonya is the British head technician at Division, and Birkhoff's replacement, as well as serving as Amanda's aide.