Buccha from Air Gear was like this before his Heel-Face Turn. He's a subversion (possibly a double one), though. He's a Big Eater who looks very fat... but he's only got about 6% body fat. He looks the way he does due to blood pooling in his stomach from overeating (which means that his gluttony is the reason he looks that way). When he exerts himself, his ridiculously sculpted body is revealed.
Maybe Emperor Charles from Code Geass. Although "old" and "big-boned", he seems a lot larger than the usually slim characters we're accustomed to. It doesn't help that in one of his speeches, he says "one must devour all".
King Gurumes from the first Dragon Ball movie also qualifies—the Blood Rubies turned him into a monstrous beast with an insatiable appetite which only grows the more he eats.
His weight is questionable due to his outfit, but Earl Tyrant of Final Fantasy: Unlimited definitely fits the glutton part. 90% of his scenes take place with him eating something or other, usually made from the negative emotions of his "subjects".
Hellsing's Big Badthe Major is the only fat character in the cast, causing a few potshots about his weight from other characters, including one of his own minions, though it doesn't seem to affect him. Additionally, some of the vampires are seen gorging themselves during the series, they simply don't get bigger because of it.
Polpo from Jojos Bizarre Adventure Part 5. Due to his position in the mob, he gets to stay well protected in a posh prison cell, surrounded by food. His Laser-Guided Karma hits him when Giornio changes a gun into a banana and tricks Polpo into shooting himself.
Wapol, who actually has eating as a power: He ate the Baku-Baku (Munch-Munch) Fruit, which not only lets him eat anything, but incorporate the aspects of what he's eaten into his body. In a bizarre subversion though, Wapol ends up being Lean and Mean as well: he actually eats his own excess bulk to fit through a door. Nobody knows how that works. Ask the writer. That'll be good for a laugh.
Commodore Nelson is extremely obese, to the point of immobility, and is almost always seen eating. Alvida, a villainess from an early arc exhibits a distinct cowboy motif and so much pork it's a wonder she can move. She's utterly convinced that she's the most beautiful thing on the seas. Later on she reappears, having eaten the Slip-Slip fruit. In addition to giving her a smooth, frictionless complexion, it seems to have made her excess weight "slip" off as well; she makes a point of stating that "the only change is that my acne is gone", though, so she might not have changed her diet any. (Her name was Alvida the Iron Mace)
She's regarded as the gourmet of the Seven Stakes, and while she is in fact a Big Eater, she's also notoriously picky about her meals.
The Titans from Attack on Titan. They exist to eat. They don't even have digestive organs. So when they get full, they puke up the people they devoured, and go eating some more.
Midora from Toriko. Ever since he was born he's been cursed with a hunger that cannot be satiated. He is the biggest and most disgusting eater in a series full of big eaters and he founded an entire organization of like-minded individuals. One of the reasons he is searching for the legendary ingredient "GOD" is because it may be the only food that can satisfy him.
Rize Kamishiro from Tokyo Ghoul is an unusual example. While she looks like a beautiful and slim woman, she is actually an infamous Ghoul known as "Binge Eater" for her tendency to go on brutal feeding sprees. While normally Ghouls only need to eat a single human about once every month or so, she steals hunting grounds from weaker Ghouls and throws any Ward she enters into chaos with her constant feeding.