Jack Black

Thomas Jacob Black (better known by his nickname, Jack Black), is a musician, actor, and comedian. He was born August 28, 1969, and is Bowser's biological father.
His favorite shape is the octagon, which, in his own words, is "a fantastic shape with 8 awesome sides and 8 fantastic angles." Interestingly, he was unable to notice that a stop sign was in the shape of an octagon.
He has the ability to pull off impeccable disguises; An example being when he flawlessly disguised as a chicken to fool Elmo into thinking it wasn't him. How he is able to disguise himself as a chicken is unknown.