Jim is a young 15 years old boy who is the first human troll hunter, but because he can't beat Angor rot and Gunmar if he stay human, so Merlin turned him into half troll and half human. He have light blue skin and messy, unkempt dark hair. Pointy ears, large stone-like horns protruding from his head, yellow eyes, and sharp lower fangs sticking out of his mouth. He is more muscular and taller than when he was a human. his left hand remains human-like but armored, his right hand grows significantly larger and loses its pinky finger, and his armor changed to Epilepsy armor. It features a black knight design with glowing red trims. It allows Jim to summon the massive Eclipse Blade and safely withstand Gunmar's dark corruption.

Toby is best friend of Jim, he usually calls him Jimbo or Jim, and he is 15 years old too. He have thick, swoop-styled brown or reddish-orange hair and bright green eyes, and he have metal braces on his teeth. His armor is a heavy, bulky set of orange-tinted industrial knight's armor designed by Merlin, which features a miner-style headlight helmet. He is usually seen carrying his signature oversized, glowing orange Warhammer that can change gravity the way toby want.

She is Jim's best friend too. She has brown eyes and dark brunette hair worn in a neat chignon bun, accented by a signature blue hair streak and colorful hair clips. She uses shadow magic same as Morgana, and with it she can make portals and control shadows. Her armor is a mystical, heavy battle armor made of dark metallic plates with glowing purple filigree and prominent pauldrons (shoulder guards) that match her shadow portal magic.

Blinky is a large, intelligent troll featuring six glowing eyes, four arms, and striking blue-green skin. He has a broad mouth with a protruding flat nose, small horns on his head, and distinct turquoise hair. He is usually seen wearing heavy brown leather suspenders and trousers fitted with large pouches. He trained Jimbo and like a dad to him since his real dad left.

AAARRRGGHH is a troll companion of Toby and a really good friend with Toby and Blinky. he usually speaks with small sentence and like a cave man. AAARRRGGHH is tall with a heavily built, gorilla-like frame featuring massive, broad shoulders and long arms that he often walks on, he has rock-like gray skin covered in deep green fur/hair that grows on his shoulders, chest, and forms a thick beard. His skin is engraved with swirling Krubera tribal patterns and a large, rounded black nose, two short, blunt horns on his head, prominent lower tusks/teeth, and incredibly expressive, warm green eyes framed by bushy eyebrows.

Gunmar is one of Gumm-Gumms and a leader. He is pure evil and kills everyone without any regret or etc. Gunmar is exceptionally large, standing at 12 feet (360 cm) tall with an incredibly muscular, almost ape-like physique. He has obsidian-black stone skin covered in jagged, glowing blue runic patterns. Later in the series, after absorbing the power of a Heartstone, these markings and cracks glow with a fiery orange-yellow light. A defining feature is his massive pair of bull-like horns sweeping out from his head, which are lined with sharp ridges and Gunmar has sharp, yellowed fangs and is missing his right eye. His weapon is a Decimaar Blade, It is a massive, broad-bladed greatsword forged from dark, jagged stone and infused with corruptive magic. He can control mind with it and the sword can drain the life force, essence, or memories of those it slays or corrupts, feeding Gunmar's power.

Angor rot is a Morgan's best warrior and really dangerous one. He tall, thin, humanoid physique with a wide chest and long, muscular arms. He stands about 9 feet 2 inches to 9 feet 5 inches tall, head is tall, slender, and skull-like in shape, Two large horns sprout from the back of his head and curve around it, wrapped in a brownish cloth or binding. He has a jagged, stone-like troll body with cracked skin that glows with subtle purple or light blue lines/cracks. His weapon is a small knife that can turn trolls into stone.

Morgana is an ancient witch who is helping Gumm-Gumms by creating the Eternal night, so they can walk freely. Her magic is shadow and she can create portals and etc. She has pure green eyes, her armor is ornate, glowing golden-bronze full-body armor with sharp, avian-like details on the pauldrons and greaves and the helmet is a tall, crown-like spiked helmet that frames her face, leaving only her glowing eyes and mouth visible. She really hates Merlin because he too her hand to create the trollhunter amulet.

Merlin is an ancient wizard that defeated Morgana once. His power is time, so he can see past and future but his power is weaker because he used all his power to stop Morgana in past. He has blue eyes and white hair with some beard. He wears a midnight-blue suit of knight's armor that emits a dark green glow.