As a whole, Saiyans (Dragon Ball series) possess ravenous and seemingly insatiable appetites, often eating plate after plate of food...
...Son Goku eating 30 meals a day...
...Vegeta and his son, Trunks eating multiple meals and massive portions of food...
America (Axis Powers Hetalia)
Liltotto Lamperd (Bleach) using "The Glutton" to eat several Soul Reapers.
Aaroniero Arruruerie (Bleach) "Glutoneria" grants him a tremendous appetite to cannibalize Hollows. Having devoured a total of 33651 Hollows.
Yoruichi Shihoin (Bleach) eating several dozens of meals at once to recuperate from her injury.
In all of his incarnations, Majin Buu (Dragon Ball) is an enormous glutton, having a nigh-endless hunger for sweets and the ability to turn anything or anyone he wants into candy.
Natsu Dragneel (Fairy Tail) have extraordinary appetite and eating capacity.
Gluttony (Fullmetal Alchemist: Brotherhood) lives up to his name.
Lionel (Isekai Shokudo) has developed an immense appetite for Katsudon…
…able to consume multiple servings at once.
Esidisi (JoJo's Bizarre Adventure Part II Battle Tendency) swallows a dynamite.
Taiga Kagami (Kuroko no Basket) is a glutton and is able to eat at least five times a normal meal.
When it comes to his favorite ramen, Naruto Uzumaki (Naruto) can consume up to 30 servings, his appetite nearly on pair with Choji Akmichi.
Monkey D. Luffy (One Piece) appetite is immense to the point...
...he could eat up to a hundred servings in one meal...
... and devour massive amount of biscuits non stop for 11 hours.
Jewelry Bonney (One Piece) is known as "Big Eater", for her ability to consume massive amounts of food.
Wapol (One Piece), thanks to his "Baku Baku no Mi" powers, can eat pretty much anything at unlimited amounts, even a knife.
"Big Mom" Charlotte Linlin’s (One Piece) love for sweets gives her a destructive eating disorder. Every once in a while, she'll start to rampage in search of what she wants to eat. In this state, she will destroy everything in her path, even her own children…
…at 6 years old, Charlotte Linlin (One Piece) appetite went out of control to the point…
…she accidentally ate Carmel and her friends of the Sheep's House.
As children, Ace, Sabo and Luffy (One Piece) were able to consume…
Monkey D.Garp (One Piece) like his grandsons has an massive appetite.
Like his mother, Charlotte Katakuri (One Piece) loves his sweets, particularly donuts...
...devouring giant sized donuts by mouthfuls.
Mamodo (Zatch Bell!) have much greater appetites than humans. Their favorite food is fish.
Lan Hikari (Megaman Battle Network) is a gluttonous curry lover, he can eat 88 different types of curry within three days.
After being starved for a whole day, Xenovia Quarta and Irina Shido (Highschool DxD) were able to consume multiple meals at once.
Kagura (Gintama) demonstrating the insane gluttony of the Yato Clan.
Gintoki Sakata (Gintama) can consume entire bowls of sweet red bean rice and parfaits without throwing up.
As the Fiend of Gluttony, Toutetsu (Highschool DxD) can devour anything from monsters to magic at an infinite capacity and is considered the strongest of the Four Fiends due to its monstrous appetite.
Aka (Isekai Shokudo) loves beef stew...
..and could eat entire large pot of beef stew in her dragon form.
As a dragon, Kuro (Isekai Shokudo) has immense appetite, able to consume countless servings of chicken curry in one meal.
Fuu (Samurai Champloo) has a vast appetite, at one point entering an eating contest and ending up one of the last two remaining.