Brittany from Dimension Heroes has been stated to fit into this trope, though it has yet to be seen.
Anyone with paranormal powers from Shadow Unit. Merely having paranormal powers doubles a person's calorie requirements, and actually using those powers burns even more calories.
Tennyo, at Whateley Academy in the Whateley Universe. It turns out her mom is a superhero with Energizer powers, and can almost out-eat Tennyo. The one time Tennyo's felt full is after consuming a horde of demons. It's possible her Big Eater habits are an effort to try and make up in quantity for some nutrient that Earth food lacks.
Exemplars and, as mentioned, Energizer type metas are also prone to huge appetites.
The players of JLA Watchtower one time got into a debate of "Which team would win an eating contest? Wally West and Jesse Quick or Gar Logan and Aurora Andersen?" Aurora is about 5'2" and small-built, but is also an animal-shifter like Gar is. Her metabolism resembles a shrew's, especially if she's been working her shapeshifting a lot. Good thing she's also the Team Chef for the Titans.
The guys from Epic Meal Time, who routinely prepare massive dishes with five- (sometimes six-) figure calorie counts and then eat them on camera. What probably helps their frames is that Harley is rather tall and Muscles Glasses (a personal trainer in real life) is often hitting the gym.
Ian and Anthony of Smosh both qualify, although Ian seems to be the bigger eater.
In Survival of the Fittest, Reika Ishida is shown to be one of these in pre-game, judging by the fact that when she orders something from A&W she gets a large hamburger meal alongside some chicken all for herself, and then snags some of the KFC bucket her sister and a friend are sharing. Note that this is a 4'9 tall and 95 pound teenage girl. Jay Holland also shows tendencies of this when he orders six McDoubles that have fries inside them, small cups normally used for condiments to be filled with Oreo McFlurry, four more burgers stacked together, a bunch of milkshakes, a large Pepsi, and coffee at a McDonalds. Though, he does use the justification that he just survived a terrorist attack, so he has the right to get fat.
The SCP Foundation has, among its specimens, SCP-913 AKA "Mr. Hungry", an apparently ordinary African-American man who requires "the recommended daily caloric intake for a normal human every 2 hours", otherwise he falls into a trace in which he will eat any solid matter he can in order to sate his appetite.
In Curveball, whenever Red Shift goes all out, his powers also accelerate his metabolism for the next few days, with a corresponding increase in appetite. In addition, if he's going to be traveling a long distance at high speed, he has to wear a special IV harness that pumps glucose and nutrients directly into his bloodstream (and he's still hungry afterwards).
Strippin jokingly refers to himself as a food disposal unit, and the premise of one of his challenge videos is to face off against Smiffy from Hat Films in a burger eating contest, with the forfeit being that the loser is slapped with a half-eaten burger. Smiffy wins. It is worth nothing that Strippin gets away with this since he is very well-built and does lots of exercise to counteract this.
Ronove in The Gamers Alliance eats a lot and always seem to stay hungry no matter how much he has eaten. His favourite foods are strawberry cakes and sand gnome legs.
Menelaos from Greek Ninja. After having caused a row by insulting Japanese food in front of Daichi, later on he is gulping down ramen and enjoying it. When Dawson questions him on it, he replies: "I like it, just I need a lot to get full", as his main grievance was that the portions were too small.