That's Messed Up Son Koala is a male character who debuted in "Happy Chalawunga!". Even though he has a deep voice, he is supposedly still a child since he was seen in Miss Smileybells's Kindergarten class in the episode "The Most Beautiful Roach in the World". He also attended another kid's birthday party in "The Tooth of My True Love".
This character as a whole is mainly a running gag, as he says his catchphrase whenever it's necessary. Obviously, his catchphrase is "Now that's messed up, son."
"That's Messed Up Son" Koala wears a black & white striped shirt, blue jeans and a hat with a propeller on it. He is short in stature.
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