Mor'du

A Bear will be one of the antagonists of Brave, hence the original title of "The Bear and the Bow".

He has black fur, big claws, long, sharp teeth, and is a massive 15 feet tall. He also appears to be part of the synopsis of the film: "The ensuing peril forces Merida to discover the meaning of true bravery in order to undo a beastly curse before it’s too late."