String Theory has Prof. Phineas Armastus, Schtein's fellow inmate and a cannibalistic serial killer.
He made a judge throw up.
Poor Xodin from Furmentation just wants sympathy, while the old man he's talking to is constantly asking if his captors tried to eat him.
Sluggy Freelance actually had a Cannibals Anonymous support group (though their definition of "cannibal" was a little loose). Freaky-Fred, one of the more crazed characters, was later shown to have a Dimension of Lame counterpart who makes rice cakes shaped like people then bites off the heads.
Schlock's gullet has been dubbed the "zero-evidence buffet" - the idea being that, if they need to dispose of a body quickly and efficiently, Schlock's devastating digestive enzymes (which have come up against nanobots and won, repeatedly) can turn the corpse into extra mass in record time.
Landon's sentient gun, Tenzy, loves the cybernetic Esspererin because they provide many materials that she can use to build drones or whatever else is needed. Of course, since the espees are sapient, this poses a small problem.
Tenzy: But... techno-organic meat pies! Landon: They've surrendered. Eating them has stopped being disturbing, and started being a war crime.
Sally, Jar-Jar Binks' player in Darths & Droids whose active imagination was responsible for a lot of stuff in the campaign, turned the Gungans of Star Wars into these and had tried to offer the other PCs as food for her people.
Jar-Jar: But wesa can can use the humans for food! Qui-Gon: That's a good... hey, wait, what!?
Girl Genius: "Snapper" Boikov and "Jack A'Horned" — prisoners in the Castle Heterodyne — are both cannibals.
The "Revenge of the Weasel Queen" radio theater sidestory has the eponymous character, Ferretina, a Spark-created fusion of human and weasel. In this comic, one of the locals from the village she's been attacking claims that she demands young, good-looking men to be delivered to her, which are then eaten (apparently grilled with cheese). This comic, meanwhile, opens with a fake out; the first panel implies that she has done this to Othar Tryggvassen, Gentleman Adventurer!, who grievously insulted her in an earlier strip, though the very next panel reveals he was simply thrown into a "Pit of Doom", which failed to kill him.
Dumm Comics had a Skadi story arc where she encountered the cannibalistic "Hill People". Read here Not work safe!
The trolls of Errant Story, though they don't usually eat humans, just other trolls. To them it's something of a compliment, they believe it grants a sort of immortality as the spirit of the eaten is passed on to the eater. They did it once to some particularly skilled humans they killed as a show of respect and got a bad rap for it. Actually one of the punishments in their culture is "no one save the dirt and the worms shall eat of your meat."
In Drowtales, Drow will eat almost anything, including humans, orcs, and their own dead. Food is relatively scarce in the underdark and some nobles suffer from malnutrition; humans are rarely actually killed for food, but to bury a dead slave is considered a waste of resources the impovershed, war-torn society cannot afford.
The D'bo sisters in Our Home Planet start off the whole comic by attempting to eat Rika and Mai (who aren't actually humans, but close enough). They're actually offended at being called cannibals, claiming that they don't eat others of their race.
Subnormality has various monsters, and most frequently Sphinx eating as many humans as they can get their mits on, and discussing ways to go about it Seen here.
I Luv Halloween - Oblivious of the zombie apocalypse, evil psychotic little girl Mocchie is handed a human liver from a zombie during her trick-or-treat routine. She then eats it.
Also Dave is put in a pot by his crocodile consorts. However, that doesn't make them cannibals, as they're not humans. And since he wasn't tied up, there was more cry than harm.
In No Rest for the Wicked, the Witch (based on "Hansel and Gretel"). It's actually portrayed as being tragic as well as horrific—-she's clearly insane, originally eating her own children in order to keep them "safe" with her at all times. When more children show up around her house she believes that they're her own who have somehow "gotten out," leading her to continue her cannibalism.
In a dark interpretation of the Treaty of Trianon, France feeds Romania and Czechoslovakia the insides of an still alive! Hungary in the appropriately-titled Polandballcomic◊ "Whiplash".
Channel Ate does this sometimes. It even had a comic poking fun at the donner party. "Though he may be gone, I guess you could say there is a little of Jim in all of us..."
A Complete Waste of Time has Graves Monskay, who is reputedly able to taste a troll's emotions through his/her blood (though it's usually fear followed by anger). Corroborating his case is when he eats his past self.
Dominic Deegan antagonist Karnak appears to have some kind of compulsion related to this; he frequently takes bites out of other demons after killing them, though he mostly spits out the gobs of meat again afterward. This is presumably related in some way to the fact that he was raised by herbivores, and spent his life as a vegetarian. Oh, yes, this demon lord is one screwed-up puppy.
In thisSaturday Morning Breakfast Cereal, it turns out the government-sponsored food called "Sponch" is made of people (probably). However, even though the shocking accusation is made in public, the reaction is a little... political.
Peter Dolcett is an online artist who created many pornographic comic strips, all of which had an extreme BDSM theme. Gynophagia, or woman-eating, featured prominently in his work.
in Tales Of Gnosis College Iris Brockman works in a strange (and extremely expensive) restaurant/mermaid bar that has this trope as its premise.
Baldy and Shorty pretend to be this as an interrogation technique in thisSkullkickers strip.
Butch of Chopping Block regularly eats the people he kills, and a lot of disgusting jokes have been made about various aspects of this (for instance, his fear that it makes him gay if he enjoys the taste of testicles.)
"Bloody Norah" of The Scumthorpe Files is a cannibalistic lake creature who turns out to be real. Right when she's about to devour Tara, Lolita steps in and offers hot dogs as a substitute. It works. Hey, humans are "long pork", so why not give the creepy monster some actual pork? (Then again, it's not like anyone would've missed Tara anyway).
In Deep Rise this is an accepted part of the culture of The Nobles, Humans are considered tasty and nutritious.
Barring Entegra, Devin(two driders) and Gloria(a gluttony demon) this trope tends to be averted with characters who would be expected to do so in White Dark Life. Damien(also a gluttony demon) is a picky eater and has a psychological fear of people tearing through his stomach lining, Saru wants to avoid any illnesses associated with cannibalism, Ophelia Is Damien's daughter and thus was told to avoid such actions, while Blake(yet another gluttony demon) just finds the idea gross and ineffective. This gets disturbingly played straight with Adult!Damien who decides the fastest way to complete his bargain with Luke(to punish 1,000 sinners) is to start eating them. In fact he even goes so far as to eat his own wife(albeit as an impromptu way of warping) in a roleplay!
In The Savage Sword Of Sharona, the Kharnivors and their "queen", Engorgia feast upon the flesh of travellers who travel across the desert where they lived.
Devils in Kill Six Billion Demons need to draw on the more stable Life Energy of corporeal beings, either through forging Magically Binding Contracts or by chomping it down directly from the source. Older and nastier devils opt for the latter rather than accept constraints on their power. Cio, a.k.a. Yabalchoath, clarifies that she wasn't being poetic about sipping the blood of her vanquished rivals.