O'Bloat is one of the two secondary antagonists in "An American Tail: The Treasure of Manhattan Island" along with Toplofty. He is voiced by Richard Karron.
Like Mr. Grasping, he and Toplofty are cruel and greedy, but O'Bloat is dumb, crazy and speaks a high voice. He has a habit of eating.
O'Bloat is a short, slender rat who has dark brown fur, crazy eyes, gray face, dark brown nose and a buck-tooth. He wore a turquoise tailcoat, a white dress shirt, an orange button-up vest, a reddish-orange bow-tie, turquoise pants and a black top hat with an orange stripe.