The Horse Himself loves Toaster Strudels, cotton candy, and apple fritters.
For Princess Carolyn (a cat), it's possiblyfish, since she wears a dress that has stamps of it and uses it as her Catchphrase.
Todd Chavez (a human) seems to have a fondness for cotton candy.
In Mike, Lu & Og, we have hot dogs for Mike (and in one episode, everyone else), JuJu Bombs, a jawbreaker-like candy, for Lu, and turtle soup for the pirates.
Miraculous Ladybug: Despite the fact that they can eat anything, each Kwami seems to prefer a specific food, especially when they need to replenish their energy. Of the known Kwamis, Tikki and Plagg enjoy chocolate chip cookies and Camembert cheese, respectively.
You could probably bribe an Autobot or Decepticon with energon, especially in Transformers: Generation 1, where the starting premise of the show was collecting energy. Energon remains important throughout the franchise since it is their only food source, but G1 was particularly bad in that it established that energon makes one drunk, too. This had two effects. One, fans love writing fanfics where Megatron is wasted. Two, it makes G1 seem like the story of rival gangs nearly wasting Earth in their competition to produce a drug.
A gag rewrite of an Armada comic had Hot Shot acting like a crackhead obsessed with a jar of jAm (it gets spelled differently throughout the comic, as he's talking in Lolcat-speak the whole time. "JaAm" is about the only permutation we never see.) - which was originally a jar of Technicolor Science-afflicted Applied Phlebotinum. It's since slipped into canon; at least one character profile says the other Autobots are puzzled by what "JaAm" is.
Richie of Static Shock was once bribed out of important information for cheeseburgers. "With grilled onions!" He later bemoans.
Pizza, the Totally Radical foodstuff. Downplayed greatly in later incarnations, but still noticeable.
The black & white comic version of the Turtles had a taste for beer. Though that may be because it was a "What Do You Mean, It's Not for Kids?" sort of comic that got toned down to be marketable to younger audiences.
In their official profiles, most of the Turtles have other favorite foods, while pizza is Michelangelo's Only food choice:
In the GBA TMNT video game each of the individual turtles are healed eating their favorite foods, Leo's food is sushi and Don's new favorite food is the hamburger Raph and Mikey's favorite foods remained unchanged.
The fourth film attempted to give Splinter one (although the scene was cut another one referencing it left in): Cake. He's also quite fond of fresh vegetables, soups, tea... and cheese. Some versions show him with a taste for Japanese fare, including sushi.
In their third TV incarnation, the turtles are back to loving pizza, Mikey most of all. This time, their obsession is given a legitimate reason, as it's the very first human food they eat when they venture to the surface for the first time.
Monterey Jack has cheese, of course. The sight, smell, or mention of "chEEeeEEeeEEeeEESE" is enough to trigger a phenomenon known as a "cheese attack". The lengths Monty goes through to sate his desire for cheese can get him into trouble... or out of it. This was exaggerated to G-Rated Drug-esque porportions on "Mind Your Cheese & Q's" when Monty vows to quit cheese after yet another cheese attack nearly gets Gadget injured by a runaway kite and even suffers withdrawal in one scene.
In one cartoon, Monty claims that his absolute favorite cheese is brie '87 (as in a brie with a vintage of 1987). Nonetheless, in the same episode, he is successfully able to resist a villain tempting him with one.
Another time, Monty and the Rangers kept a local cafe open while its owner was on vacation and Monty's recipe for "cheese chowder" proved popular enough to keep the cafe busy and save the owner from having to close for good (as well as foiling a bank heist, as the bank robbers planned on tunneling through the abandoned cafe to get to the bank next door).
In "Out of Scale," Dale throws a chunk of Limburger cheese into a toy truck, commenting that Monty will love it. Of course, Monty smells it and goes into "cheese attack" mode — until he finds the shrink ray gun and attempts to drag it back with him, only to have the smell of Limburger literally drag him away. Monty fights it — until the smell taps him on the shoulder and goes up his nose.
Scooby Snacks. Shaggy likes them a lot too; in fact, Daphne and Velma can often use the snacks to convince both of them to do something they're too scared to do otherwise. And in at least one episode, when the duo is being chased by a monster, they come across boxes of them; after eating them, they get a second wind and are able to keep running.
Homer and donuts (pictured above), porkchops, and Duff Beer in earlier seasons.
Marge thinks potatoes are "neat". She has also occasionally shown to be fond of buttered noodles.
During the show's beginnings as animated shorts on The Tracey Ullman Show, the family would often celebrate good times by going out for Frosty Chocolate Milkshakes. This didn't carry over to the full-length episodes, however. (Except for the occasional Mythology Gag.)
Ed seems inordinately fond of buttered toast and gravy as well. Ed has a BATH filled with Gravy for no apparent reason. He even goes out of his way to protect it when Eddy tries to use it as a "gravy grave" when he temporarily becomes a supervillain of some sort.
Rolf and meat products in general. This becomes a plot point in one episode where several of the boys make a bet to give up a defining trait for as long as possible. Eddy had to give up yelling, Double D had to give up his advanced vocabulary, Johnny had to stop listening to Plank and so on. Rolfs and Ed's challenge was, of course, giving up meat and gravy. Nobody lasted for the full school day but Ed was the last one at the end and won.
Eddy loves omelettes (and making them).
Eddy: "You haven't lived until you tried one of my omelettes!"
Ron and Nachos. "Taco meets nacho. I call it the Naco". Kinda strange, because "naco" in Mexico is used to describe someone or something that's tacky, trashy, or sleazy. As a side note, the "Naco" now exists in real life!
Both Ron and Rufus like cheese in general. Rufus even insists that the meaning of life is cheese when asked by his descendants in an alternate future.
In an episode of The Real Ghostbusters the heroes are trying to find Slimer's Evil Counterpart, "Big Green" in a supermarket. While this would at first seem like the proverbial bull in a china shop, they can't find him. Then Ray asks Slimer what he would want if he could eat anything at all in the supermarket. Slimer quickly leads them to the ice cream freezer, and sure enough, Big Green is there.
Early seasons had Cheesy Poofs and pot pies as Cartman's favorite snacks. In later seasons, he's just a Big Eater and gets obsessed over any kind of fatty junk food that the plot requires.
In the bonus material of one season, Stone and Parker introduce each episode while performing a fake show called "Makin' Bacon with Macon," in which they feed pig parts to a pig. Macon loves bacon! As anyone who's ever been around pigs can tell you, cannibalism is by far the least of their indulgences.
Ozzy and Drix; Drix loves Vita-Crunch, a brand of healthy snack bars. He's even memorized the jingle.
An old Looney Tunes adaptation of "The Shoemaker and the Elves" shows that the elves themselves love donuts, especially when they can dunk them in coffee. The Shoemaker and his wife gain their help after they share one with a hungry elf; later, after they become rich as a result, they throw the elves a party with lots of donuts.
Beavis and Butt-Head mainly subsist on gas station Mexican food, especially nachos and tacos. In fact, one of the few things that can make them show up for school is when its Taco Tuesday in the cafeteria. Sometimes they'll eat other junk food like pizza (in "Prank Calls") or burgers (any episode where they're shown working at Burger World).
Twilight Sparkle once devoured some hayburgers and horseshoe-shaped fries like a shark tearing into a seal, at one point using another burger to wipe the ketchup from the last two burgers off her face, and then that burger goes down the hatch in two bites.
Pinkie Pie had a very cute song about making cupcakes, which she suddenly launched into while Apple Bloom looked on in confusion, cute enough on its own and then it led to a grimdark fanfic of legend, so Pinkie and cupcakes are very much ingrained into the fandom. She also loves chocolate.
Also, in My Little Pony: Equestria Girls, there is a scene where Twilight can't figure out how to use a vending machine in the human world, and the alternate Trixie dramatically announces "THE GREAT AND POWERFUL TRIXIE—! ...needs some peanut butter crackers." and takes them with a "Voila!" Needless to say, the fandom made the assumption that they would be Pony!Trixie's favorite food, whether or not they even actually existed in Equestria... and then Trixie mentions them in her sleep in the season 6 finale two-parter.
Sonata Dusk, The Ditz of the villain trio in the second Equestria Girls movie, lets Big Bad Adagio Dazzle finish her rant about her Evil Plan and then says "And after that, can we have lunch? It's Taco Tuesday!" Cue the flood of Sonataco fanfic/fanart (yes, a Portmanteau Couple Name with a character and her favorite food is possible).
The Apple Family and apples. It's not just their favorite food, it's also their main source of income!
Rainbow Dash with the Apple Family's cider. She even freaks out at the idea that an infestation of fruit bats might prevent cider production. Later taken to new heights when the mere mention of cider snaps Rainbow to attention.
Spike absolutely loves eating gemstones, at the point that his love for them has been used as a little plot device now and then. When gemstones are unavailable, he seems pretty fond of ice cream. When Twilight Sparkle was busy trying to avert a coming disaster, he ate an entire tub of it just because she was too distracted to tell him not to.
According to fanon, Derpy Hooves/Ditzy Doo really likes muffins. This was born from a blink-and-you'll-miss-it moment in "Applebuck Season" where she hungrily says, "Muffins," in the background - not only blatant Flanderization, but not even wholly reliable due to the fact that two other ponies mouth the word at the same time, calling into question whether Derpy even spoke the audible line in the first place. Nevertheless, this is such a pervasive and universally accepted component of her fanon characterization that it got a nod from the production staff in "Putting Your Hoof Down," where Derpy's bag is seen with a muffin clip◊, and when a limited edition Derpy Hooves toy was released, the box art included muffins. Her association with muffins (if not explicitly calling them her favorite) was canonized in "Slice of Life", when she offered one as an apology to Cranky Doodle Donkey for messing up his wedding invitations.
Hilariously subverted in the fanfic Address Unknown: Derpy tells Twilight that she hasn't been able to look at a muffin without wanting to throw up since the Baked Bads incident in "Applebuck Season".
Similar to the Derpy/Ditzy case above but at a smaller scale, Soarin, the male member of the Wonderbolts that is often depicted alongside Spitfire, has been flanderized by fanon to be obsessed with pie. This is mainly because his first appearance in the series is of him purchasing and eating an apple pie. Though canon has not confirmed that pie is a favorite food of his, (it was never mentioned when he returned in the season 4 episode: "Rainbow Falls") an official series of MLP trading cards has a line about "ponies joking that his pie eating has set more records than his wings" in his card's description.
Big Good Princess Celestia seems to have a fondness for cake. She judges a baking contest in "Mmmmystery on the Friendship Express", and a candid photo of her in "Ponyville Confidential" has her caught eating a slice of cake.
Ever since the Hub Network put this recipe set up on their website, fans have jumped on the idea that Princess Luna has a fondness for grilled cheese sandwiches. They are described as Glorious, after all. It figures the Princess of the Night would be fond of such a popular late-night snack.
Yogi Bear: anything in a "pic-a-nic" basket. It sure beats the alternative:
Beast Boy is borderline obsessive about tofu. Beast Boy is down on meat in general since, as an animal-based shape-shifter he has "Been most of those animals" and the thought of eating them squicks him out.
The Fairly Oddparents: Wanda and chocolate. In the episode where Timmy was considering wishing for all the food on earth to be dessert, Wanda tries to talk him out of it, only to immediately be on board once Timmy not-so-subtly spells out that she'd basically have all the chocolate she can eat. In another episode, it's revealed that "Chocolate City, Utah" is Wanda's favorite place on earth. It is also heavily implied that Timmy enjoys waffles, as most prominently seen in Mr. Right!, where he guesses he was having waffles for breakfast (in opposition to his parents obvious hints about having cold cereal).
Coop loves his Philly cheese steaks. At one point, Glorfft tortures him by eating a cheesesteak in front of him (though Glorft wasn't exactly enjoying eating it as well.) One episode in particular had Coop eat a Philly Cheese steak, but wrapped in bacon and deep fat fried. He was also a fan of Ham Wrapped in Pizza. Coop loves food in general. He apparently won several awards for competitive eating. And the space pirates accused him of cheating in one such competition. Coop also has a weakness for the "Stratospheric Strawberry Slime" slushies. To the point that the destruction of one of them is torturous to him (als used in the above example with the Glorft) And may God have mercy on someone who dares to destroy a slushie machine in Coop's presence, because Coop certainly won't...
Pickles the Drummer of Metalocalypse loves cinnamon buns, Nathan Explosion is crazy for chips (he'll eat them nonstop if you let him) and Toki Wartooth adores candy. Also, Charles Foster Offdensen has quite a taste for pie- fandom will usually portray him having varying degrees of ravenousness for the flaky-crusted, fruit-filled dessert.
Bump in the Night: Mr. Bumpy loves eating socks. He even sings a whole song about it.
Numbuh Three has shown a love of popcorn in a handful of episodes, and Numbuh 5 loves candy and ice cream (even more than everyone else). In fact, many episodes that center around Numbuh Five have her seeking out ancient artifacts that have something to do with both, in a clever parody of Indiana Jones movies. Her friend-turned-enemy Heinrich Von Marzipan and her frienemish arch enemy Stickybeard shares her love for candy.
Numbuh One also seems to like meatball subs, although Lizzie claims that they go straight to his already big butt, and for all kids chicken nuggets are as valuable as gold.
Basically everyone loves birthday cake. Specially the ones made for the Delightful Children From Down the Lane's birthdays, which is a plot point in various episodes, since the delightful's favorite birthday activity is to eat their cake while forcing everyone else to watch.
Numbuh Two is also surprisingly fond of spinach, even though no other kid likes them. This was evident in an episode involving the... Spinach Inquisition.
Jake the dog loves spaghetti, even dreaming about having pillows full of the stuff. He also enjoys ice cream and sandwiches.
As mentioned by the Ice King, Finn's favorite food is meatloaf.
The Emperor's New School has Kuzco's love for Mudkas Meat Mugs, to the point where he tried to eat nothing else in one episode, and Kronk's affinity for spinach puffs, which he is borderline obsessed with.
The Powerpuff Girls: The Mayor really likes pickles; he's rarely shown eating anything else. He often calls the Powerpuff Girls on their hotline to get help opening pickle jars. He apparently likes bananas even more, however, because in one episode, a banana distracts him from Mojo Jojos "remote controlled pickle".The Mayor's also gave away his position of mayor to Princess when she bribed him with a roomful of Turkish Delight. Keep in mind, he did this after turning down several attempts at large cash bribes.
Kick Buttowski seems particularly fond of Cheetah Chug (made with sweat from real cheetahs!) as do Gunther with anything lingonberry related.
Bugs Bunny loves carrots. And coffee, to the point one of the episodes centered on him trying to beat his addiction to coffee by replacing it with an energetic drink. After finding out that the drink was worse and more addictive, Bugs decided to refrain to one cup per day... The doctor never specified the size of the cup.
Henry Chickenhawk loves chicken.
Not to mention Elmer Fudd and his love of grilled cheese, there's even an entire song about it.
Eduardo has potatoes, which initially began as a joke (to explain why he had a handy potato sack) and became a running gag throughout the show. Later on and less frequently, Jackie Khones made it clear that he loves sandwiches, even going to court with Madame Foster over one.
Frankie and her grandmother's cookies, DEAR GOD. It's enough to turn her from a stable human being to a complete cookie addict.
Daria: Daria and Jane both really like pizza. Daria's family also eats frozen lasagna for dinner almost every night (but that just might be because Helen's too busy with work to cook an actual meal). Daria has also on several occasions expressed a fondness for cheddar fries.
The threeshowsfollowingthe original Ben 10, the title character was shown to love chili fries and smoothies, the latter a case of irony as between the original series and Alien Force he refused to drink them. Ben says it was an acquired taste.
In Omniverse, his partner Rook tends to enjoy the alien fare that Max Tennyson makes along with the casseroles Bem's mother makes. On a more unhealthy note, he also becomes hooked on meatball subs in one episode and has also grown fond of smoothies.
After having his DNA to become a duplicate of Ben, Albedo shares Ben's love of chili fries, but is annoyed by it and blames it on Ben's DNA. Word of God confirms he actually does love the fries and is just flat-out in denial.
In The Magic School Bus, Arnold and chocolate mallo-blasters. He has a lesser fondness for a Cheeto-expy and spent a month prior to the events of the cell-themed episode eating Sea Wheedies ( sea weed-covered carrot chunks) and NOTHING ELSE.
Muscle Man on Regular Show is a Big Eater in general, but seems to have a particular affinity for Wing Kingdom chicken wings. The entire cast also fell in love with The Best Burger In the World, a cheeseburger stuffed inside another cheeseburger with two deep fried cheeseburgers for buns, but its only served once every hundred years.
Tino, Lor, Carver, and Tish from The Weekenders really like junk food, especially chili cheese fries and Chug-A-Freezes.
Beetlejuice: Although Beetlejuice will eat any insect or bug, his cuisine of choice are — what else? — beetles.
But not killer beetles, since they bite back.
Wile E Coyote And The Roadrunner: Wile E. Coyote will endlessly pursue the Road Runner, because, according to the two-reeler The Adventures of the Road Runner, the bird is a myriad cross section of delicacies, including papaya, licorice, Wisconsin cheddar, double martini (very dry), Yorkshire pudding and pistachio. Wile E. even brandishes a book on Road Runner recipes.
Fish Hooks: Milo and his apples. In fact, many fishes and other pet shop animals are shown to greatly enjoy them.
Steven Universe: Steven loves Cookie Cats, Donuts, Fry Bits, and Pizza... but the first got discontinued. So instead, they now make Lion Lickers, which Lion loves instead.
Star vs. the Forces of Evil: Star's entire race, the Mewmans, and corn. Every time we've seen some sort of Mewman celebration or feast, corn on the cob has been the centerpiece. Their most important holiday, Mewnipendence Day, is half-based around eating corn.
On ToddWorld, Todd is very fond of his macaroni and cheese. He likes to eat it in the bathtub if he can, but he's fine eating it anywhere.
On The Loud House, Mr. Grouse loves Mr. Loud's lasagna, to the point where the Loud Kids bribe him with it whenever they need him to do something for them.
While the If You Give a Mouse a Cookie and associated spin-off books (If You Give a Pig a Pancake, etc.) were all about each particular animal being given a particular type of treat, this is only carried for Mouse in the Animated Adaptation on Amazon, in which he is still very big on cookies, particularly chocolate chip. Though in the show, he doesn't seem to require milk, though he does like to have it with the cookie if it's around. He's even something of an advocate for cookies. In the story "Sick Day," in which all of the other animal characters get a cold, he invents a whistling system for them - one whistle for a glass of water, two whistles for hot soup and three if they want a cookie. They all say they're too sick to want a cookie, but he says they never know.
On Llama Llama, Llama Llama really has a thing for pancakes. He even gets a birthday cake made of pancakes.
Dexter's Laboratory: Dad goes absolutely nuts for his wife's muffins; she actually has to enlist the kids' aid to keep him from eating them all.