Pauly Bleeker of Juno and orange Tic-Tacs, his "only vice."
Shoot 'em Up: Mr. Smith hates a lot of things, but seems to really like carrots. This is largely part of an extended Bugs Bunny reference. It also makes sense in that he has no money to speak of, but can grow them in an abandoned greenhouse for next to nothing. He also makes a crack that they're "good for your vision," going toward his superhuman aiming skills.
In the 2010 The A-Team, an angry Baracus can often be calmed by coconut curry with toast points, especially when prepared by Murdock.
In The Professional, Leon drinks nothing but milk, and is often shown going to the local store to buy more. It's part of his portrayal as a curiously innocent and childlike assassin. Part of Mathilda's training involves drinking lots of milk, which she does not care for.
In G.I. Joe: The Rise of Cobra, Duke really likes Dubble Bubble gum, and reluctantly gives his last piece to Breaker before the Paris chase scene begins. Breaker's love of the bubblegum is a carry-over from the comic character's trademark trait.
In Branded to Kill, the antihero is obsessed with rice and constantly orders it, but it's the aroma that he loves.
Donny, one of the characters in Cornered!, was nicknamed "Donny Donut" since he's almost always chowing down on them. In the end, the killer force feeds him them until he chokes.
Bubba and his "srimp" in Forrest Gump. Forrest himself loved ice cream, and was also a big fan of the soft drink Dr. Pepper. (Unfortunately, drinking too many caused him to need to make a run to the bathroom right when he met President John F. Kennedy.)
Mystery Team: "Chocolate milk just tastes better than regular milk"
Agent Sands from Once upon a Time in Mexico loves his puerco pibil, and will order it in any restaurant that he comes to in Mexico. Sometimes he'll eat a dish of this that he considers too good, prompting him to go around back and shoot the cook. In one of the extras for the movie, the "10-Minute Cooking School," Robert Rodriguez actually lays down how to make it.
In Zodiac, the lead police officer loves animal crackers.
Karl from Sling Blade loves his "french-fried potaters."
Alex of A Clockwork Orange with his Milk Plus, which he drinks in preparation for a bit of the old Ultraviolence.
Harry Knuckles and bananas.
The Amazing Spider-Man: This incarnation of Spider-Man seems to have a fondness for chocolate milk. Gwen Stacy herself is so fond of chocolate that she once wished she could live in a chocolate house, which tips her dad off when she claims to not want to come to dessert.
Ghostbusters (1984): Twinkies are considered Egon Spengler's favorite food thanks to a scene in which he uses a Twinkie to illustrate the amount of paranormal/supernatural activity in New York City. After Harold Ramis' death, some fans left Twinkies outside the fire station used as Ghostbusters HQ for both films.
The Blues Brothers: Jake's four fried chickens and Elwood's dry white toast. Elwood moreso, seeing as he seems to just carry white bread around with him everywhere if the scene where he tries out a toaster he happens to come across by making himself some toast is any indication.
Marmalade for Paddington bear, just like in the books.