Gunmar

Gunmar is the true main antagonist of the Netflix computer animated TV Series, Trollhunters. He is the leader of the Gumm-Gumm Trolls, an evil troll race who were sealed away along with him into the Darklands by Deya the Deliverer, and is Bular's father.

He is voiced by Clancy Brown.

Birth
Gunmar was born from the Heartstone of the Troll race. When the wars between humanity and Trolls were unleashed by the domination of the surface, the horrible killings and deaths of people corrupted the Heartstone, causing it to rot from within, and from inside it Gunmar was born. He also killed the King of the Quagawumps.

In the series
He fought against Orlagk for the right to be the leader of the Gumm-Gumms, a battle that ended Bronyak's death and the loss of his eye. After the Troll world and the human world are separated, Gunmar led his army to conquer the world and to destroy human race. This unleashed a war between the Gumm-Gumms and the rest of the Trolls that ended when the Trollhunter, Deya the Deliverer, defeated Gunmar, sealing him and all his army to the Darklands again.