Rowry Duck
From SquackleWiki
Rowry Duck was transformed into an evil being after he ate a lot of Doomsday Bread. His feathers turned dark red and his wings began to grow claws on the ends. His feathers became more like scales than feathers and his beak turned black and pointed.
He is known for providing alternatives to proposed plans that accomplish the same thing, but in a harder way.
Relevant articles:
http://squackle.com/22577/stories/hooty-mchoothoot-and-the-ducks-of-doom/