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.
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 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.
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.
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.
The Orange Light of Avarice in the Green Lantern comics 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.
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.
Obelix from the Astérix comic books. He eats whole wild boars at times. But don't call him "fat" out loud if he's nearby.
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".
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 Eighties 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).
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...