Averell Dalton from the Lucky Luke comic books and animated series. So is the dog Rantanplan, sometimes. On occasion, they're both bordering on Extreme Omnivore.
Averell Dalton:(eating Chinese food) The long salt sticks and the thin pancakes taste good! Jack Dalton: Idiot! Those are the chopsticks and the tissues!
After Barry Allen was killed and Wally West took over as The Flash, there was an attempt for a while to make him a more realistic speedster by limiting his speed to around 700 mph and forcing him to intake massive amounts of food to maintain his energy. Later, after merging with the Speed Force, he no longer needed to eat, though that didn't stop him from stuffing his face in the blink of an eye. At least up until the death of Bart Allen, most of DC's speedsters were depicted as ravenously hungry.
Illustrated in this sequence, in which Wally was eating a burger "the size of [his] head".
Linda: I thought you didn't need to eat like that any more? Wally: I don't need to. I want to.
Speaking of which, Bart's a heavy eater as well; the only piece of food he's seen to explicitly reject is raw fish.
Speedsters powered by the Speed Force don't need to eat huge amounts of food (if they choose to do such, the Speed Force Hand Waves away the negative effects); these two just choose to do so because they really like eating.
When Wally is "Kid Flash" for the comic Teen Titans Go!, though, "Troy" has him needing to eat a lot to keep his speed up. Likewise, for his animated Young Justice version, Wally needs to keep at least a few energy bars on his person when he's got to run for long periods of time without stopping to eat.
Issue #26 of Green Arrow (Rebirth) reveals that Barry Allen needs to eat 50 times his body mass a day to keep up with the calories he burns. This equates to 4422 kilograms or 4.42 metric tons of food daily.
In DC Comics' 52. Sobek (the stuttering crocodile) is a Big Eater animal Mascot... until he catches Kid Hero Osiris in a moment of weakness, at which point he graphically kills and eats him, and reveals himself to be the Horseman of Famine, created to have a vast hunger which can only be quenched by eating great heroes.
Jughead from Archie Comics. There was actually one story where two fat kids asked him how he managed to eat so much and stay so skinny. He attributed it to lots of running. From Big Ethel.
One comic attributed Jughead's skinniness to a unique metabolism. In it, he undergoes some sort of an accident (a whack on the head), which reverses it so that he always gains calories from everything he eats, causing him to gain a ton of weight. It's reversed somehow after he is fed cafeteria food and Dilton theorizes that the effects of his metabolism just can't be reproduced.
Another comic has Dilton conduct a study on Jughead, funded by Hiram Lodge, by constantly feeding him to see if there's a way to artificially reproduce Jughead's metabolism. Jughead ends up gaining an enormous amount a weight and, upon reaching critical mass, loses it all in a single explosive belch. Dilton conclude, like in the previous comic, that Jughead's metabolism can't be replicate and Hiram Lodge is stuck with an enormous grocery bill.
Another comic suggested that all the calories went to his brain and were the cause of his perfect memory (in that story). When he follows a normal diet he's unable to remember his own name.
In yet another comic, when he starts eating healthily to set a good example for his baby sister, he starts passing out a lot and it turns out he's hypoglycemic (or at least comic-book!hypoglycemic).
In yet another story, Jughead tells Betty and Veronica he stays thin with peanut butter. They eat a ton of it and gain weight like nothing. When they confront him, he says that he just really likes peanut butter and his exercise regiment must keep him thin. The girls pummel him.
One short story shows that Jughead is a highly popular babysitter around the neighborhood because he's good with kids and charges very little. Parents note, however, that he ends up being fairly expensive because he cleans out the kitchen while they're out so they have to completely restock.
In a one-page story from the comic, Jug's excess caloric intake winds up in his muscles! He's strong enough to knock over two people accidentally by shrugging his arms in a "I don't know" gesture.
Another story had him rip out one of Pop's old stools single-handedly! This scares Archie and Reggie, who see this first-hand. And cause them to try to replicate it with their own excess caloric intakes.
In the reboot series Jughead was shown to have been Formerly Fat. He was a spoiled rich kid but lost weight when his parents lost all their money, and thus he couldn't eat the stuff he could before.
Maggy from the Brazilian Monica's Gang comics. Her favorite food is watermelons... which she swallows whole. In one story, Dracula (or other generic vampire) bites Maggy without knowing who she is and, in a rampant hunger, she starts to bite and transform every single person she meets in a vampire, creating some sort of Vampire Apocalypse. After learning that the world order may be in serious trouble, Dracula must go back in time to prevent this.
In the comic DP7, Blur is another example of a super-speedster who has to constantly eat to fuel his metabolism. Before he got his superpowers he was overweight, bordering on obese, and worked as a manager at a fast food joint.
Played for Drama with Mary Jane's teenage cousin Kristy, who appeared shortly after Peter and MJ's marriage. She was constantly eating, despite being thin as a rail As it turned out, she was bulimic. (Of course, most of the fans figured that out quickly, but the reasons why ran deeper.)
The Orange Light of Avarice induces an insatiable hunger in its wielder Agent Orange. Larfleeze is first shown gorging himself on rotting food. When Hal Jordan wrests the Orange Lantern Battery away from him, a voice from within the battery which, according to Word of God, belongs to the Embodiment of Avarice tries to convert him into the new Agent Orange, saying that he deserves more.
"You could really go for a hamburger right now. Two hamburgers! It should all be yours, Mr. Jordan!"
Larfleeze later demands a planet-sized feast along with his own Guardian in exchange for joining the fight against the Blackest Night.
Sin City's second book, "A Dame to Kill For", has Agamemnon, the guy Dwight consults for developing his pictures. Dwight describes him as "cheerful as usual and eating as usual."
Hellboy tends to eat loads and loads due to his inhuman metabolism.
The second issue of Thor - The Mighty Avenger demonstrates why Thor should never be granted free access to your fridge. Asgardians in general are typically portrayed as big eaters compared to humans.
Lupo and Skin from Minimonsters.
Deadpool himself can put away lots of food in some issues, there's almost a page of him mentioning food, stuffing his face, or surrounded by half-eaten food. When he's feeling "down" he tends to binge on junk; when he's feeling "up" he has a quirky obsession with chimichangas.
Flare has complained at least once of not getting a big enough meal at a restaurant.
Greedy Smurf in The Smurfs is a big eater in whatever media format he appears in.
Roxy from Jem and the Holograms can't go an issue without eating something at least once or referencing food.
Cassandra Cain, the second Batgirl, is generally one, with an issue of her solo series showing her stopping at a diner to eat a half-dozen cheeseburgers. In her case, it seems to be a mix of an impoverished upbringing and an absurd daily regimen.
My Little Pony: Legends of Magic: Rockhoof in Issue #2 takes this to comical levels — most of his nights out are spent taking on one eating challenge after another, ranging from scarfing down bowls full of oats and mountains of bread to literally eating his way out of a pit full of corn. Deconstructed when destiny calls and his eating habits have caught up to him.
The Dandy had Desperate Dan, a larger-than-life cowboy who was a constant challenge for Aunt Aggie to feed. His usual fare was a cow pie — a beef pot pie with a filling consisting of a whole longhorn cow, with the horns sticking out of the crust.
Sabretooth in Marvel. Depending on the Artist, he can be very bulky muscular, or more lean in build. But he's been shown to be this. When he was the X-Men's prisoner, it's revealed he can eat 22 meals in 24 hours. While at a diner, he has eaten three large steaks, and tells the cook he's ready for his fourth.
The Marsupilami, all of them. They're relatively small animal, arround 3 feet 5 inches, but they can eat enormous amount of fruits, nuts, sometime insects, and dozens of piranha in a matter of seconds. even the baby marsu, small enough to fit in the palm of a hand, can eat several time their weight just a few week after being born.
Double subverted whenever he mentions going on a diet and cut down to 'just two boars' for diner. For Obelix, according to Getafix, that amounts to not eating anything. When it happens for cases other than "dieting", it is cause for concern among his friends.
The best Obelix example is from a movie (not shown: him eating the Beast because he didn't have his dessert).
Harvey Comics has Little Lotta, whose defining traits were her huge size, her near-super strength and her huge appetite. One of her comic book series was named "Foodland". In one story she "trains" for a pie-eating contest by eating and is depicted either holding or eating food in every panel leading up to the contest. When she wins, she eats all of the left-over pies so they won't be wasted, then declares that she never did care much for pie.
Fatty of Class IIB, Bash Street School, from The Beano.
Minnie the Minx's (also from The Beano) nemesis Fatty Fudge, who had a brief solo series in The '80s where he would travel around the world eating different countries' national dishes.
Big Fat Joe from The Beano originally had his own strip back in the first issue and in the 1950s became one of Lord Snooty's pals.
The Three Bears from The Beano are a group of three fat bears (a mummy bear, daddy bear and a child bear) who are always trying to steal grub (usually from Hank's store).
Little Plum's "Chiefy" from The Beano could put it away too. In one story, Plum was trying to arrange some entertainment for the tribe and considered engaging "Fat Fred", a champion pie-eater who could eat forty pies for lunch. He thought better of the idea when he realized that the tribe could already see Chiefy eat forty pies as a snack.
Growing up Jughead from Archie Comics (2015) was fat and a spoiled rich kid. Eventually his parents lost their money and he became thinner.
The super-hero parody team The Inferior Five had the Blimp, who was obese, always hungry, and always eating. He even went so far as to keep his Lukewarm Line (the communicators the team used) in his refrigerator, as he knew if he kept it there he'd always know where it was.
Allfather D'Aronique from Preacher is rather disturbing. Not only is he practically spherical and too heavy to fly in a helicopter, but he's bulimic, and he has a golden finger-on-a-stick that his servants use during his meals.
It's hard to tell if Grossout from Scare Tactics is fat as he is essentially a walking tumor. But he definitely was fat before he was Blessed with Suck.
In Judge Dredd, there's a subculture called the Fatties, whose collective hobby is eating and entering eating contests. Many of them are so fat that they need support wheels attached to their bellies just to move. In early comics, they were tolerated; they have since been declared illegal, but they still exist.
J. Wellington Wimpy from the Popeye newspaper comic strips was seldom without at least one hamburger in hand. Given a chance, he'd have a HUGE stack of them.
Or eat anything else he could gyp victims out of...ducks, sausage, potatoes, or even a baby's bottle!
Domoli from the Douwe Dabbert comics. Being able to conjure cakes and pies from thin air doesn't really help matters...