Terrence

Terrence is a recurring villain in Foster's Home For Imaginary Friends and is arguably the series main antagonist - he is the 13-year old brother of Mac, the series protagnist, and like many older brothers enjoys picking on his little brother - however Terrence goes beyond the usual antics of an older brother, being a downright bully towards Mac on many occasions: in fact he seems to make it his main priority in life to make Mac as miserable as possible.

However like many bullies in cartoons Terrence is extremely dumb and as a result is easily outsmarted - this doesn't seem to stop Terrence from trying new ways to do bad things to Mac and his friends, not seeming to learn much from his many mistakes in the past.