At least in the first two editions, shamans with Raven are describes as either obese or rail-thin, and either way being almost unable to turn down an offer of food.
Orks and Trolls in general require much more food than Humans or Elves.
1st Edition supplement Shadowtech. Symbiotes are tailored microorganisms that greatly increase the body's healing rate but also increase the user's appetite by 50% to 100%. The biological augmentation known as the "suprathyroid" gland improves physical attributes significantly at the cost of doubling caloric intake. The two side effects are cumulative, so a character with both could have to eat up to four times the normal amount of food per day.
The Increased Consumption Disadvantage means a character will eat much more than their size and weight would imply.
Increased Consumption can be used as a Temporary Disadvantage limitation on many advantages, to represent said advantages being Cast from Calories.
Similarly, the "Gluttony" drawback, which can be taken with the "Skinny" drawback. Leading to a character who needs to make a will save not to eat any food they see, but (unless you buy off the Skinny drawback) never even hits average weight.
Space Marines inside Warhammer 40,000, though they are more ridiculously muscled than thin. Their Super SoldierBio-Augmentation releases hormones in their body for the muscle growth, but such growth still needs to be fueled by their daily feasts (by our standards) and wildlife hunted. They also are able to be Extreme Omnivores, known to eat healthy meals of concrete and metal (and have super-tough bones that only work because their diets are laced with ceramic-based chemicals). Furthermore, eating is one of the few mortal pleasures the Space Marines can enjoy.
The biggest eater of all the Space Marines was the primarch of the Space Wolves Leman Russ. How? He was the only primarch to beat the Emperor in something, twice, namely an eating contest, and a drinking contest.
The Tyranids, also from Warhammer 40000, are the pinnacle of big eaters. A race of intergalactic insects who descend on the Milky Way with the intent of devouring all life and natural resources in order to fuel their hyper accelerated evolution process. And if you thought that was enough to qualify for this trope, it is hinted that the Tyranids have already successfully carried out this plan in the past, effectively strip mining several galaxies prior to their arrival here.
Some of the books for Werewolf: The Forsaken state that the Uratha have greater appetites than most (partially because they're part-wolf, partially because of the metabolism required for their Healing Factor). As a result, four meals a day is normal for most of them.
Novas in Aberrant have both hyper-enhanced metabolisms that keep their bodies trim and a need for vast caloric intakes to help fuel their Quantum powers. One mentions once having gone to Burger King for 50 Whoppers And a Diet Coke.
The Atlanteans from Conspiracy X need to eat a lot of calories to power the nanomachines that keep them immortal and give them their superpowers.
Hollow Earth Expedition supplement Mysteries of the Hollow Earth. Any character with the Flaw of Ravenous must eat twice as much as normal or suffer from the effects of starvation.
In Hc Svnt Dracones a number of Pulse's Bio Augmentations result in increased food consumption. A character with Macro Enhancement or three Muscular Enhancements requires about 30,000 calories per day. Fortunately Pulse also makes "superfood" with ten times the calories, for just four times the price.
Dragon had a recurring series of humor-oriented short stories called "The Wizards three", supposedly featuring Mordenkainen, Elminster and Dalamar meeting at Ed Greenwood's house to trade spells. All three fit the Trope, often depleting Ed's refrigerator and pantry every time. Eventually, Dalamar was replaced by Mordenkainen's apprentice Rautheene who fit the Trope even more; Ed expressed shock that she could put away entire gallons of butterscotch ice cream without it affecting her slim figure.
Sentinels of the Multiverse: Tachyon's Super Speed powers are Cast from Calories, so she is able to constantly put away food in vast quantities without gaining weight. In the "Sentinels of the Ninth" crossover for Bottom of the Ninth, it's said that she gets her salary in stadium food, "a decision the league regrets".
Gurps has the Gluttony disadvantage which can be taken with the Overweight, or Heavily Overweight, disadvantage. If the character buys off the Gluttony disadvantage, he won't lose any weight.
The Ogres of Warhammer have this as their hat, so much so they have twice daily feasts. And they worship a god of gluttony. There is even a point in one of the books where two Ogres eat a 5-ton Rhinox in one sitting; by the time they are done they both have more than their entire body mass in raw meat crammed into their stomachs.
One dissection of a fallen ogre, itemising the stuff in its stomach, turned up the skeleton of an entire horse.
Crosses into Bizarre Alien Biology: an ogre's internal organs are a lot different from a human's (notably, being bigger and more elastic), and the paunch on their guts isn't fat, but actually a specialised layer of muscles used for grinding up food more effectively.
Ogres abandon skinny babies to die in deadly caves. A small percentage of these, Gorgers, survive to adulthood and escape to the surface lean, muscular, blind, insane, and hungry. They can unhinge their jaw like pythons to swallow large prey whole, and are led into battle by an Ogre butcher (priest) carrying fresh meat.
Ogres from Changeling: The Lost don't have to be fat, but it's hard to be thin when you are designed to eat anything on the planet.
Sesus "The Slug" Nagezzer from Exalted, whose road to obesity was similar to Henry VIII (see below) — a war wound left him unable to exercise and work off the massive amounts of food he continued to eat every day.
The Tarrasque, as of 4th edition, is an unstoppable curse laid by a being older than the gods that plagues the world. It exists only to eat, and it can eat entire kingdoms before going back to sleep.
On a much lighter note, depending on the edition, any wizard who makes a habit of using Mordenkainen's Magnificent Mansion a lot will likely become one. While the interior of the Mansion produces food for anyone inside, it's not real, and whoever eats it becomes very hungry upon exiting, and has to eat a lot to regain his strength. This is only true in earlier editions of the game, though. In later editions the food that the mansion produced couldn't be taken out to be eaten later, but it functioned just like any other food as long as it's eaten inside the mansion before the spell ends.
Shadowrun ogres, a subtype of orks, are hit with a double-whammy: they've got huge appatites but also have a highly efficient metabolism that allows them to survive on much less food than a normal human can. This makes it virtually impossible for them to avoid becoming extremely obese.