Jeffy

Jeffy is a 12 year old boy that likes to cause chaos in the house of the cool mario bros. he first appeared in episode 5. he was revealed to be a traitor in Season 3. He worked for Bowser.Jr in Season 1, Wario & Waluigi in Season 2, & Zoey the Doxen & her cat trio in Season 3. He is the main antagonist of Season 4.