In the Super Mario Bros. fan-comic The 3 Little Princesses Peach loves peaches, to the point where apparently the fruit is named after her (instead of the other way around).
Black Mage of 8-Bit Theater also likes pie. Specifically, evil pie.
As also indicated by the first strip, Guenevere and chocolate. She also gets througha lot of milk. (Gawaine's call for beer is really just indicative of a general fondness for alcohol; he actually prefers somethingstronger.)
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In the Awkward Zombie comics about Katie's real life, her love for garlic often pops up.
Norrin: Is this enough garlic? Katie: No. Norrin: You didn't even look. Katie: It will never be enough garlic.
The favorite food of choice for Bob and George is/was ice cream. Well that, and beer. Many of the sub/fancomics got their own, too. One even went so far as to name the comic after it.
One character from an in-universe story told in Boy and Dog is the only one in his village who likes liver.
Champions of Far'aus has an In-Universe example with Proctor Henrith Galemore the eleventh, king of Galemore. He is better known as the Popcorn King, because his diet consists mainly of popcorn, and hes almost never seen without a bag of it, which he constantly eats from, and the gold coins that are being minted during his reign have his face on one side, and a piece of popcorn on the other. He even notes himself that he is better known by his nickname.
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A handful of these exist in Charby the Vampirate: Charby likes chicken, Mye loves gummy bears, Crispo is obsessed with nachos, Biscut named itself after its favorite food and Breck compulsively shovels down muffins if there are any in front of him. Menu will eat anything.
Ixia from Cloudscratcher is deeply into any kind of breakfast food.
The Cubi race in Dan and Mab's Furry Adventures scores double. They don't actually need to eat regular food and feed off emotions instead, and each Cubi has a favourite emotion. However, they can eat for pleasure, and typically eat nothing but one or two favourites. Of the main cast:
Fa'Lina seems to have a thing for muffins.
Dan loves ale and according to his sister has eaten almost nothing else in the last three years.
Abel is unusual for a Cubi, in that he eats regularly and eats a range of foods.
Dominic Deegan and "mapvel candies". The threat of said candies no longer being available was enough to trigger a Heroic BSoD.
Dregs: The nudist likes dog food (or "doge chow"). Chub points out that if she was going to be stealing from them anyway, she could have stolen some real food instead. She doesn't care.
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In El Goonish Shive, Mrs. Dunkel has been mentioned to bake brownies on multipleoccasions. The Dunkel's seem to like brownies so much that they named their cat "Brownie".
According to his son, Baron Wulfenbach of Girl Genius "really loves waffles."
In Teh Gladiators, guest gladiator Leeroy Jenkins (of World of Warcraft fame) is seldom seen without his crab cakes. Made doubly funny because, in the actual game, crab cakes are a very low level food that would take an entire stack and several minutes to bring a max level character back to full health. True to this, the one time he actually fights on the heroes' side, he doesn't finish eating and get up to attack until after the battle is over. As for the actual Leeroy Jenkins, his food of choice is chicken.
Halo of Grrl Power loves spicy food — so spicy, one restaurant makes her sign a waiver.
Amethyst Lashiec absolutely loves barbeque sauce, such that she'll drink it straight out of the bottle.
Her father, Royce, loves fancy foods in general ("Cuisine" being listed as his muse), but seems to like birthday cakes so much that he not only has one every day, but the theft of said cake is considered grand theft and a capital offense.
You dial up a thick T-BONE STEAK, which you are sure Becquerel is in the mood for because he is in the mood for steak every day and is never in the mood for anything else.
WV loves TaB, and also likes to eat things that are green. Anything green, compulsively and apparently subconciously.
Inside the box, there are 12 pieces of CHALK in every color of the... 10 pieces of chalk. In most colors of the rainbow.
Terezi likes things that are red. Anything red. She's also partial to orange creamsicle.
John loves Fruit Gushers. He has a bit of a Heroic BSoD when he discovers that Fruit Gushers are a Betty Crocker product, since he rightly believes that Betty Crocker is an evil monster.
In Hyperbole and a Half, Allie's was mistaken for hot sauce for years due to an attempt to impress a family member. She was not pleased by this, especially when she got sets of hot sauce for Christmas instead of toys.
A statistically absurd number of characters in Irregular Webcomic! describe frozen yoghurt as the best thing ever. Curiously, this does not include the resident Big Eater, Professor North Dakota Jones, whose favourite food is "whatever's pricey, yet available in large quantities". With someone else paying.
Kill Six Billion Demons: The Inexplicably Awesome Auntie Maya loves noodles, even helping herself to a noodle vendor's wares while a pitched battle erupts around her. They're a dish of particular significance to her, since she was a noodle vendor's daughter before becoming a Master Swordswoman and God-Emperor.
Rocky from Lackadaisy loves his pancakes. They're at the forefront of his mind whenever he goes to a restaurant, and he has trouble figuring out a plan "B" when the place doesn't have them.
Psychopathic Man Child Thog loves ice cream and only delays a boredom-driven rampage for fudge ripple.
The hobgoblins' love for Gouda cheese is referred to a few times.
The Monster in the Darkness will eat pretty much anything (except babies, and that includes veal), but his favorite of all foods is stew. Stew is Serious Business for the MitD.
The Petri Dish: In one strip, Thaddeus shrinks down to a microscopic universe and meets a microbe who really loves these fruit called poonooboo berries.
PHD: Don't try to eat Cecilia's chocolate. And of course Mike Slackenerny will eat anything that's free.
In Pokey the Penguin, the hero and most other penguins are obsessed with "Arctic Circle candy", which appears to be some sort of plant that only grows in the Arctic Circle.
In Polandball, each country has its stereotypical national dish as a favourite. They're even fond of repeating the names of their favourite food in random background dialogue, or use other countries' favourites as racist slurs. Especially common ones are Turkey with kebab and the USA with burgers.
Ricky from Ratfist loves chili. No, maybe you're not understanding here: Ricky loves chili. He finds a bowl of fresh chili, preparednote almost exactly the way he likes it, in the middle of the street. So he eats it. Bonus points: It was left there by his ex-boss, who mixed in a little cat feces because he needed to infect Ricky with Toxoplamosis gondii.
Schlock is fond of a drink mix called "Ovalkwik." The ingredient list is here.
Ch'Vorthq: Sergeant, you will be drinking a very heavy stimulant cocktail cut with shampoo and high-tensile inert carbon. Schlock: I don't drink it, I eat it straight. Ch'Vorthq: And I suspect you're addicted to it. Schlock:(aims plasgun) Step away from the tub of happiness.
The cast of Schlock Mercenary are also fond of the noble 'Chupaqueso', which is, effectively, melted cheese, wrapped in fried cheese, traditionally garnished with cheese. It's not a good food for a prolonged lifespan, but mercenaries don't tend to live that long anyway.
Gav is a cryo-frozen refugee from the 21st century, and is very fond of Guinness beer. It still exists in the 31st century, but was pretty hard to find. That is, until Gav accidentally cloned himself 950 million times, and suddenly every brewery within a thousand light years wanted to take advantage of the sudden economic opportunity this presented.
Shortpacked!: Robin and anything sugary, given that it catalyzes her Super Speed. Two specific items are more associated with her than others, however: Skittles, which she's often been told she smells like; and Cadbury Cream Egg cerealnote really just Cadbury eggs in a bowl with milk, which gets her so hyper that she blacks out for long stretches of time as she causes increasingly absurd things to happen.
Aylee went through one stage of her life cycle where she would eat nothing but potatoes. During other stages, her tastes have not been as innocuous, however...
Teddy from Weak Hero is often seen with a bottle of cola in hand. At least until Gray violently beats him up with a cola can, leading to him avoiding soda for a while due to the traumatic memory.
The title character of Weesh recharges his powers by eating licorice.
In Yokoka's Quest, Yfa is often shown eating apples, and rarely anything else note (Yfa is seen eating carrots and rice which Azha prepared), both inthecomic and in other artwork. He even talks about his favourite type of apple in a q&a strip. Raya has a similar preference for grapes, though this is only shown in works outside of the comic itself so far.