<Ul> <Li> Anton Yelchin (seasons 1--2) as James "Jim" Lake Jr . / Trollhunter, the first human Trollhunter and a reluctant hero dealing with the pressures of leading a double life . He has a talent for cooking and eventually sword - fighting, and cares deeply for his mother and friends . </Li> <Li> Charlie Saxton as Tobias "Toby" Domzalski, Jim's best friend and confidant . Dorky and excitable, he fully embraces the secret world of trolls and aids Jim in his quests . His weapon of choice is a warhammer . </Li> <Li> Jonathan Hyde as Walter Strickler, Jim's history teacher who is actually a Changeling . When Jim discovers the truth, he loses all respect for him and the two become bitter enemies . However, he remains affable toward Jim and has redeeming qualities . </Li> <Li> Kelsey Grammer as Blinky, Jim's six - eyed troll mentor . A wise and scholarly troll with a heart of gold, he serves as the brains of the Trollhunters and eventually becomes a sort of father figure to Jim . </Li> <Li> Fred Tatasciore as AAARRRGGHH!!!, a burly troll and close companion of Blinky who forms a deep bond with Toby . He was kidnapped by the Gumm - Gumms as a child, which stunted his vocabulary . Tormented by the atrocities they committed, he deserted Gunmar to live a life of peace . However, he will still fight to protect those he cares about . </Li> <Li> Lexi Medrano as Claire Nuñez, Jim's girlfriend . She is a feisty, kind, jolly, sarcastic, curious, and intelligent tomboy who enjoys books and is a talented martial artist and gymnast . She obtains the Shadowstaff, a staff capable of creating portals activated by the user's emotions . </Li> <Li> Victor Raider - Wexler as Vendel, the leader of Trollmarket . An ancient and wizened troll, Vendel is at first suspicious of Jim and often comes across as a pessimist, but shows a softer side and eventual faith in Jim . </Li> <Li> Ron Perlman as Bular, the son of Gunmar . A brutish and powerful troll warrior, he's obsessed with freeing his father from the Darklands . He holds a special disdain for Changelings, whom he considers "impure", putting him at odds with Strickler and other Changelings who seek to free Gunmar . </Li> <Li> Amy Landecker as Barbara Lake, Jim's protective and overworked mother . Her husband left the family when Jim was five years old . Her doctor job means she's often away from home, which lets Jim pursue his Trollhunter duties . </Li> <Li> Steven Yeun as Steve Palchuk, a narcissistic bully who frequently harasses Jim . Suspicious of Jim's unusual behavior, he eventually discovers the truth and teams up with Eli Pepperjack to help Jim in Season 2 . </Li> <Li> Matthew Waterson as Draal, the son of previous Trollhunter Kanjigar . He is originally jealous and suspicious of Jim but later befriends him--acting as Jim's fighting tutor . During a battle in the museum, Draal sacrifices his lower right arm while removing the Trollhunter amulet from the Killahead Bridge to close the portal, and later obtains a mechanical prosthetic . Draal explains that his father kept a distance from him as he grew up, and he had hoped to become the next Trollhunter that he might earn his father's approval . </Li> <Li> Lauren Tom as Nomura, the Changeling museum curator and a colleague of Strickler . Originally an antagonist, she was pulled into the Darklands and imprisoned by Gunmar for her failures . When Jim is captured in the Darklands, the two form a connection and escape together . </Li> <Li> Jimmie Wood as NotEnrique, the Changeling swapped with Claire's baby brother Enrique . While troublesome and self - serving, he isn't actively malicious and even helps the Trollhunters from time to time (usually after being bribed). He forms a rocky but brotherly connection with Claire . </Li> <Li> Clancy Brown as Gunmar, the iron - fisted leader of the Gumm - Gumms who reside in the Darklands . He is powerful and ruthless, and will readily dispose of loyal minions and allies who can no longer serve him . He has no qualms about enslaving or killing his fellow trolls to accomplish his goals . </Li> <Li> Tom Hiddleston (series premiere) and James Purefoy as Kanjigar the Courageous, Draal's father and the noble Trollhunter prior to Jim . His ghost tutors Jim, often worrying about Jim's team fighting style, believing that the Trollhunter must work alone to avoid endangering those he cares about--this leads to Jim's guilt and decision to venture into the Darklands alone . </Li> <Li> Ike Amadi as Angor Rot, an ancient troll warlock - assassin who hunts down Trollhunters and takes their souls . In medieval times, Angor made a deal with Morgana, surrendering his own soul in return for his mystical powers . </Li> <Li> Rodrigo Blaas as Gnome Chompsky, a Gnome adopted by Toby . He started out as a "rogue Gnome" causing trouble, but after he was finally defeated by Jim he became friendly when he was given a dollhouse to live in and a plastic doll to be his companion . He later helped locate Enrique in the Darklands and also helped rescue Jim from the Darklands . </Li> <Li> Mark Hamill as Dictatious, Blinky's brother . Presumed dead, he helps Gunmar in his quest to conquer the surface lands . He is blinded by Blinky during a struggle in the Darklands . </Li> <Li> Anjelica Huston as Queen Usurna, the queen of the Krubera (AAARRRGGHH!!!'s race who live in the Deep Caverns), and a member of the Tribunal (a council of troll leaders). She initially seems to be a kind queen concerned for AAARRRGGHH!!!'s well - being . As a Tribunal member, she is strict and judgmental, and leads the Tribunal to act against Jim and his friends . Late in Season 2, she reveals herself to be a traitor who works for Gunmar and helps him take over Trollmarket . </Li> <Li> Cole Sand as Eli Pepperjack, a nerdy classmate of Jim who believes in the paranormal . In Season 2, he teams up with Steve Palchuk to investigate the strange creatures they both have seen and to help Jim . </Li> <Li> Lena Headey as Morgana / The Pale Lady, an ancient and seemingly malevolent entity and the patron of Angor Rot . </Li> <Li> Tom Kenny as Otto Scaarbach, a "Changeling Polymorph" who can change into the form of anyone . He is the "Grand Commandant" of the Janus Order, a secret society of Changelings who assist the Gumm - Gumms . </Li> <Li> David Bradley as Merlin, the wizard who created the Trollhunter's amulet . </Li> </Ul> <Li> Anton Yelchin (seasons 1--2) as James "Jim" Lake Jr . / Trollhunter, the first human Trollhunter and a reluctant hero dealing with the pressures of leading a double life . He has a talent for cooking and eventually sword - fighting, and cares deeply for his mother and friends . </Li> <Li> Charlie Saxton as Tobias "Toby" Domzalski, Jim's best friend and confidant . Dorky and excitable, he fully embraces the secret world of trolls and aids Jim in his quests . His weapon of choice is a warhammer . </Li> <Li> Jonathan Hyde as Walter Strickler, Jim's history teacher who is actually a Changeling . When Jim discovers the truth, he loses all respect for him and the two become bitter enemies . However, he remains affable toward Jim and has redeeming qualities . </Li>

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