Mor'du

Mor'du is the main antagonist in Brave, Pixar's 13th film. Originally a human prince, his hunger for power ended up turning him into a bear. He is voiced by Frank Welker

Background
Mor'du was once a  prince and was the oldest of out of all his siblings. He seeked to rule the entire kingdom and started a war. Mor'du then went to a witch to gain the strength of ten men, but the witch instead turned him into a bear, and Mor'du eventually lost control of his actions and killed his family. The kingdom was destroyed and Mor'du lived in the remains of his kingdom.

Role in the film
When Merida is a young girl, she ventures into the forest, looking for a lost arrow. Mor'du, hidden from her, silently stalks her through the forest until the Will o' the Wisps lead Merida back towards her family. Mor'du follows her and attacks, battling King Fergus and the guards while Merida and Queen Elinor flee. During the battle, Fergus' sword shattered when he struck Mor'du, who then devoured Fergus' leg, causing Fergus to develop a hatred against the bear. Mor'du then vanished, and wasn't seen again for several years.

When a teenage Merida and Elinor, who had been transformed into a bear, arrived at the ruins of Mor'du's castle, Mor'du awoke once Merida stumbled in. Just as Merida learned of Mor'du's past, he revealed his presence to her. Merida attempted to flee, and with help from Elinor, managed to successfully exit the ruins. Mor'du made an attempt to give chase, but Elinor buried him under several large stones, allowing the two to escape.

That night, Mor'du was wandering the forest when he noticed Merida riding her horse towards several stone menhirs, where Elinor has been captured by Fergus and the other clans. Mor'du pursues her and confronts the clans. Despite the clans attempts to battle Mor'du, he proves more powerful and easily defeats them all. He and Fergus briefly confront each other until Mor'du overpowers him. Mor'du then attacks Merida, pinning her down and preparing to devour her.

Before Mor'du can kill her, Elinor escapes from her bonds and tackles Mor'du to defend Merida. The two transformed bears battle each other to decide Merida's fate, but Mor'du proves to be more powerful and subdues Elinor before turning his attention to Merida, who attempts to defend herself with a spear. However, Elinor drags Mor'du away and begins slamming him against a stone menhir repeatedly, causing it to break. Mor'du knocks Elinor away, but before he can resume fighting. the menhir collapses on him, crushing him. Now dead, Mor'du's spirit is freed and nods in thanks to Merida and Elinor before transforming into a Wisp and vanishing.

Trivia

 * Mor'du is widely regarded as one of the darkest and most evil Pixar villains, along with Hopper, Syndrome, and Lots-o'-Huggin' Bear.
 * The film's original title, The Bear and the Bow, is a direct reference to him.
 * Mor'du is the second Pixar main antagonist to be a bear, after Lotso.
 * Mor'du is the first Pixar main antagonist to never speak.
 * Mor'du is the fourth Pixar main antagonist to die.