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Big Fat Baby is a character that appears throughout multiple seasons and is voiced by Grey Delisle.
Little of know this friend regarding their age, gender, or creator. Their imagined age could be somewhere between 0-2 and with no defining features the gender might be male or female. Big Fat Baby is used mainly as a joke filler or visual prank, however, this friend otherwise has little to no appearance or interaction with the main characters.
Big Fat Baby has light tan skin, and wears a white diaper.