Paul Amos as Vex: a Mesmer. A sadomasochist Dark Fae with a sarcastic and raunchy sense of humor, he can control people 's bodies against their will, including forcing them to kill themselves or commit murder. Vex is a favorite of the Dark Elders and has a "like - hate '' relationship with The Morrigan, serving as her hit man. He plays a pivotal role against the Garuda when Bo recruits him for her team and he uses his powers to delay the Garuda using Trick 's blood to reverse the Blood Laws and reignite a war between Light and Dark. (Original Pilot, "Vexed ''; Season 1, 2, 3, 4, 5) Emmanuelle Vaugier as Evony Fleurette Marquise: The Morrigan. A Leanan sídhe and the ruthless, cunning, and vengeful leader of the local Dark Fae, she can melt and dissolve flesh with her touch. She runs a talent agency in the human world where she represents young musicians and artists while feeding off their talents and stealing their lives in exchange for fame. (Season 1, 2, 3, 4, 5) Inga Cadranel as Aife (aka Saskia in Season 1): a Succubus and Bo 's birth mother. She is the daughter of Trick, the Blood King, and Isabeau. After rebelling against the truce imposed between the Light and Dark Fae and killing a Dark Elder, she is delivered to the Dark Fae for execution. Instead of being put to death, she endures many centuries of imprisonment, torture, and rape by a Dark King before she is able to escape. She masterminds a suicide bombing that kills most of the Light Fae Elders and critically injures The Ash. (Season 1, 3, 4, 5) Rachel Skarsten as Tamsin: a Valkyrie. Dyson 's new detective partner after Hale became the acting Ash. A mercenary and bounty hunter aligned with the Dark Fae, she is not pleased with being forced to work with a Light Fae partner. She is building a case against Bo for attacking and feeding on a member of the Dark Fae, and rendering him unconscious. Initially, she has no problem showing her distaste for Bo or Dyson 's infatuation with her, but develops an attraction and respect for Bo, to the point of questioning her own loyalties. At the end of Season 3, she sped her truck towards the ghostly figure on the road that she thought was Bo 's father, and drove off a cliff with Dyson sitting next to her. She was reborn at the beginning of Season 4, and firmly took Bo 's side. In Season 5, she moved in as Bo 's roommate and initiated a "friends with benefits '' relationship with Bo, later confessing to Bo that she was in love with her. Tamsin was heartbroken when Bo responded that she loved her, but not in a romantic way. Tamsin moved out in "End of Faes '', exasperatingly telling Bo, "You and Lauren, you two, you 'll just always be a couple. Even when you 're not. '' Later she told Lauren, "I entered the game, I lost. That 's life. The best woman won. I 'm over it. '' Tamsin afterwards renewed her friendship with Bo. After Lauren broke up with Bo for a second time, Tamsin visited Bo to comfort her and was unknowingly seduced by Hades, who had transformed himself into Bo 's likeness. Tamsin was impregnated by him. In the series finale, "Rise '', she gave birth to a daughter. All Valkyries die during childbirth, but before dying Tamsin reassured Bo that she would always live through her daughter (Dagny), her legacy, and asked Bo to look after her. Bo promised that she would do everything to protect her. (Season 3, 4, 5) Vanessa Matsui as Cassie: an Oracle. (Season 1, 4, 5) Kate Trotter as The Norn: an Ancient with the power to grant one 's strongest desire in exchange for that which they hold dearest. When Bo was fighting her mother, Aife, Dyson sought her intervention, for the second time in his life, and offered her his "wolf '' in return for transferring his strength to Bo; but he did not realize that what he now valued most was his love for Bo, and The Norn took his ability to love her or anyone else, instead. (In "End Of A Line '' the voodoo witch Laveau told Dyson that his love "prison '' -- i.e. his love for Bo -- was of his own making.) The Norn returned Dyson 's love passion after Kenzi threatened to cut down her Sacred Tree with a chainsaw. (Season 1, 2) Clé Bennett as the Ash: leader of the Light Fae. He wants Bo to choose alignment with the Light, and orders Lauren to find a way to distract Bo so as to prevent her from attacking and killing Vex -- which could have jeopardized the peace between the Fae clans and given the Morrigan a reason to execute Bo. He is badly injured in an assassination attempt by Bo 's mother, Aife, and left in a comatose state on life support at the end of Season 1. (Original Pilot, "Vexed ''; Season 1) Aron Tager as Mayer: a Luck Fae. He is a bookmaker running a gambling business with both Fae and human clients. He was Bo 's Dark Fae contact and told her where Vex could be found. His niece, Cassie, is an Oracle and in exchange for a favor allowed Bo to meet with her and reveal information about her birth mother. (Original Pilot, "Vexed ''; Season 1) Vincent Walsh as Lachlan: the second Ash. A Nāga, he wins the position of The Ash in a stag hunt after the previous Ash is left comatose. He is a stickler for rules and a commanding leader who does not hesitate to assert his authority, punish insubordination, and do away with anyone who threatens the Light Fae and the secret existence of the Fae. The Nāga has the power to kill the Garuda with its venom; but after losing his other heads violently for their toxin, Lachlan knows he can not defeat his ancient enemy and before facing him in a fight to the death he has Lauren draw his venom so that she can turn it into a weapon for Bo to kill the Garuda with. (Season 2) Lina Roessler as Ciara: a Fairy - Scuffock hybrid. The warrior daughter of a Fairy father and Scáthach mother with powers of lightning - fast velocity, she taught the art of war to Dyson and his wolf - shapeshifter pack. Referred to as a Fairy Queen by Trick and Bo. She is a past love of Dyson, and they are reunited after the passage of centuries and become romantically involved; but although she is in love with Dyson, he is unable to respond in kind since The Norn has taken his ability to love. While she is initially treated frostily by Bo and Kenzi, Bo eventually comes to consider her a friend. She is killed by the Garuda when she shifts in front of Bo to protect her from the thrust of his sword. (Season 2) Anthony Lemke as Ryan Lambert: a Dark Fae Loki. He is a wealthy playboy who amassed a fortune as an inventor, alchemist, and supplier of rare and costly items. He crashes Bo 's birthday party to give her an engraved bracelet that, she later learns, can protect her from a species of Fae. Without her knowing that he is Dark, the two become lustful lovers after Bo 's relationship with Dyson ends, and her romance with Lauren is interrupted when Nadia is released from her coma. (Season 2) Athena Karkanis as Nadia: Lauren 's human girlfriend. She accompanied Lauren to the Congo as a photographer and while there The Ash caused her to be stricken by a mysterious illness that leaves her in a coma -- thereby manipulating Lauren into pledged servitude to him and the Light Fae. Bo is forced to kill her when she becomes possessed by the Garuda and attacks Lauren, threatening her life. (Season 2) Hayley Nault as the Nain Rouge: a divine Fae spirit that likes to observe tragic events and materializes as a young girl. The Nain Rouge appears to Bo when unexplained Fae deaths begin to occur and gives Bo a vision wherein she is the cause of Trick 's death. When the reemergence of the Fae 's ancient enemy, the Garuda, begins to create strange events in nature, the Nain Rouge answers Bo 's call to show herself and tells Bo that for her to defeat the Garuda she needs to build a united team of Light and Dark Fae. (Season 2) Raoul Trujillo as The Garuda: an ancient and fiendish powerful enemy of the Fae. The Garuda transforms into a gigantic fiery eagle, and can possess and control its victims. Its source of food is anger and rage, and can only be killed with the venom of a Nāga. When the Blood King (Trick) writes the truce and Blood Laws that ended the Great War between Light and Dark, the Garudas dwindle as they starve to death until only one is left, remaining dormant for eons. When Trick uses his blood powers to stop Aife from hurting and killing Bo, it revives the Garuda, which then comes in search of Trick to force him into using his blood to repeal the Laws and reignite the war between Light and Dark. He is killed by Bo with Lachlan 's venom. (Season 2) Aaron Ashmore as Nate: Kenzi 's boyfriend. Kenzi and Nate used to be neighbours when she was six years old and they meet again by coincidence sixteen years later when he answered an ad for a musician gig at Bo 's surprise birthday party. Kenzi broke up with him when the Garuda 's threat was most imminent and could have endangered his life, and she was also worried that The Morrigan would steal Nate 's life after she offered to be his talent agent. (Season 2) Shawn Doyle as Dr. Isaac Taft: a psychotic human scientist and Fae hunter. He appears at Lauren 's apartment delivering a research award after she fails to attend the special presentation ceremony. Dr. Taft deceptively courts Lauren until, after several failed attempts, he convinced her to join him in performing cutting edge medical research in his private laboratory. He knows about the Fae and Lauren 's involvement with the supernatural race, and wants her expertise about them to inflict cruel revenge against the Fae after his brother was beheaded by one and he was blamed for the crime. Taft kidnapps Dyson to extract his DNA for use on himself, but Lauren secretly sabotages the DNA transplant and turns him into a human - Cabbit hybrid. He is killed and eaten by Dyson. (Season 3) Deborah Odell as Stella Nashira: a Lodestar. She is recruited by Trick to mentor Bo in her preparation for the tests she has to face during The Dawning. She and Trick fall in love and leave together for Scotland in the season finale. In the pre-Season 4 webisode "Prophecy '', Trick explained to Hale that he and Stella had ended their relationship. (Season 3) Rob Archer as Bruce: a bodyguard and hatchet man for The Morrigan (species unknown). (Season 3, 4) Tim Rozon as Massimo: The Druid. Massimo 's mother is Evony Fleurette Marquise (The Morrigan), who gave birth to him in the 1980s but then abandoned him and ordered Vex to raise him. (Season 3, 4) Christine Horne as The Keeper: the inquisitor of The Una Mens. (Season 4) Kyle Schmid as Rainer: a rebel Fae. (Season 4) Ali Liebert as Crystal: a waitress at the diner Lauren worked in while in hiding. The two started to develop a bond until Crystal had sex with Lauren after the Fae coerced her to do it so as to gain her trust, and thereafter kidnap Lauren. They were both chained and locked up in a cell together. (Season 4) Mia Kirshner as Clio: an Elemental Nymph. Clio had the ability to commune with all four elements of nature - Earth, Wind, Fire and Water. She helped Dyson transverse the intersecting planes of existence, which made it possible for them to get on and off the Death Train. (Season 4) Amanda Walsh as Zee: an Ancient and aka Zeus. (Season 5) Luke Bilyk as Mark: a Shapeshifter and son of Dyson. (Season 5) Noam Jenkins as Heratio: an Ancient and aka Hera. (Season 5) Shanice Banton as Iris: an Ancient and aka Nyx. (Season 5) Lisa Marcos as Alicia Welles: a human. (Season 5) Eric Roberts as Hades: an Ancient and King of the Underworld, Tartarus, and Bo 's father. (Season 5)
who plays dyson's son on lost girl
Luke Bilyk