What is the name of the main villain in 'Brave'?

The main villain in Brave is Mor'du.

Mor'du is a gigantic black bear created when a proud prince uses a witch's spell to gain extraordinary strength. The spell offers him a chance to repair the family bonds he has broken, but he chooses power instead. His decision transforms him permanently and turns him into the monstrous creature feared throughout the film.

Mor'du's backstory parallels Merida's central conflict with her mother. Both stories involve family tension, pride, and the danger of refusing to mend damaged relationships. The film gradually reveals that Mor'du was once a human prince, making him more than a conventional animal villain.

A common mix-up is identifying the Witch as Brave's villain. She causes the transformation, but she is not the story's primary antagonist. Mor'du is the bear who attacks Merida and Queen Elinor and embodies the destructive consequences of unchecked pride. His fuller origin is told in the Pixar short The Legend of Mor'du.