Played straight with Kamiya Taiga of the Magaki Wolves, whose little fang is just one of the many lupine qualities he has.
The less morally righteous folk and many non-human creatures of the Slayers series usually have more intimidating fangs than the usual endearing variety. The half-demon half-dragon Valgaav has the most menacing fangs, while the affable demonic priest Xellos has a smaller, but no less scary set. Creatures such as trolls and werewolves also have fangs.
The cursed chimera Zelgadis also has a set of less-than-adorable fang-like teeth on his upper jaw, but they're almost never seen unless he's completely livid.
Viral from Gurren Lagann is a crossbreed of human, cat, and shark — with the teeth to match.
In Hellsing, every vampire is shown to have a full mouth of razor-sharp teeth. This trope is often subverted with Seras, but she later subverts it as well when she drinks Pip Bernadotte's blood, becoming a full vampire.
They seem only to have the mouthful of fangs when they choose to; even Alucard has given a few wide smiles without showing anything sharp. Makes sense, considering how fluid their physiology seems to be in general.
In Wolf's Rain, the wolves' fangs don't mean they're evil (being the main characters, they're portrayed very sympathetically), but it certainly means they're dangerous. The wolves are realistically drawn, and on top of that, the animators added wolf growls/snarls at the appropriate
In the second series, Dragon Ball Z, this was subverted with both Piccolo himself and the introduction of his race, the Namekians. Despite even having the aforementioned pointy ears and claw-like nails, they're mostly gentle, simple villagers - even the few warriors among them only seem to act in self-defense. Why a race of vegetarians have fangs is never explained.
It makes perfect sense. Gorillas, also herbivorous, have big fangs. They're used for shredding tough plant fibers.
Which raises another question: namely, why a species that needs only water to survive would develop to eat anything.
However, it should be noted that Cute Little Fangs are also much in evidence, as they appear to be a genetic trait of the Ushiromiyas. But then, at least in Maria's case, they aren't mutually exclusive...
In Fullmetal Alchemist, the homunculus Greed, who, for some reason, has shark-like teeth, is an example. Kinda...while the homunculi are the antagonists for the series, Greed's also the least homicidal of the group and the only one to pull not only a Heel-Face Turn, but also a Heroic Sacrifice.
Johannes Krauser II, from Detroit Metal City. Krauser is actually the main character Negishi's shocking and violent stage persona, complete with an intimidating costume. The fangs always appear when Negishi puts on the costume and make up but, at least in the OVA series, it's never shown whether he puts them on as part of the costume, or if they just inexplicably grow when he takes on the role of Krauser.
In Fairy Tail, all Dragon Slayers have fangs, the sizes of which seems to reflect the personality of the character. Shy Wendy has two pairs of little ones; exuberant Natsu has two pairs of medium sized ones, or sometimes two rows of them, if his mouth is wide open and dark; and brooding Gajeel's teeth are huge and sharp all the time.
Spider-Man villains Venom, Carnage, and the other evil symbiotes. Generally, when a symbiote possesses someone good, there's no mouth, but when it possesses someone bad, there's a mouth full of fangs. Toxin is a neat example. When the host is in control, there are no fangs. When the host lets the symbiote take over, it gets fangs.
Similiar with Flash Thompson as Venom - his default mode has no mouth, but fangs tends to appear when he is losing control to the symbiote.
Attempted, to complete failure, with the Ferengi on Star Trek: The Next Generation. The Ferengi sharpen all their teeth regularly, but somehow still look goofy.
The whole "being short wrinkly bald guys" thing probably has a lot to do with that.
On the other hand, the Klingons often pull it off. In the first episode of Enterprise, Reed mentions with some apprehension that Klingons reputedly "sharpen their teeth before battle". Depending on which episode of Star Trek you're watching, the Klingons might be "Fangs are Tough" rather than "Fangs are Evil."
True Blood. Interestingly, they don't put the fangs on the canine teeth as standard, but on the teeth right before the canines. They also make a flick sound when they extend and retract, like a switch blade.
It's worth a mention that the fangs themselves are usually not the most frightening, but the reveal of a character thought to be human having them is, leading to many an Oh Crap moment. Most notably, a truly shocking scene during the fifth season:
Mike Spencer: I came to look at the body.
Sookie: What body?
Mike Spencer: Yours. (FANGS)
The Sidhe on Merlin have filed teeth, but are otherwise so tiny and unintimidating that they may well qualify as Cute Little Fangs.
Invoked on Scrubs. Sort of. JD has a few imagine spots in which he is Dr. Acula and vants to suck teh blood.
On Supernatural, hunters will check for fangs when they suspect a being may be a vampire. Many monsters have fangs in this series, but a vampire's fangs are retractable.
The Helghast in the Lone Wolf series have fangs in their bottom jaw.
Films — Live-Action
Nosferatu is interesting, because Count Orlock's fangs, rather than being his canines, are his front teeth, giving him a ratlike appearance and causing him to look far more grotesque than most vampires.
The Headless Horseman in Sleepy Hollow has filed teeth. (It Makes Sense in Context; despite being headless for most of the movie, he does eventually get his head back, complete with pointed teeth).
This may be why the mostly-friendly vampires of Twilight are literally fangless.
Subverted in that vampires that eat humans far outnumber ones that don't, and yet all vampires lack fangs.
Varney the Vampire was the first vampire to have fangs. Despite how bad that book is generally considered to be, fangs have caught on enough for Dracula to have them.
Most of the vampires found in folklore around the world had a piercing tongue or mosquito-like proboscis for sucking blood. It was only in European Gothic literature of the 19th century that fangs caught on as their indispensible physical characteristic.
The Anzati, vampire-like aliens in the Star Wars Universe, are like the former. Except they suck brains instead of blood.
The 'possessed' in The Night's Dawn Trilogy have the ability to shapeshift their form and often take on the appearance of monsters of legend. Several of the first ones to appear keep their appearance, but with fangs, presumably in imitation of vampires.
The Mixitor in Spaceforce are not real supernatural vampires, but they can still extrude venomous fangs and sink them into the neck of their prey.
In Magnus, all the Fallen Angels have vampiric fangs to signify their evilness.
A tribe in Discworld sharpens their teeth to points. Not for any particular reason; apparently, they just like the effect when they grin.
The vampires have these, of course. Even the ones who aren't interested in biting people.
In Wicked, Elphaba was born with a full set of sharp fangs, and it was a painful and nightmarish experience for her mother to try breastfeeding. But as she grew older, her fangs fell out and were replaced with normal teeth.
A card played by Elves against Humans in the ''Witcher Saga''. Humans have canine teeth, and therefore are clearly hardly better than wild beasts. Incidentally, Elves in the Witcherverse are herbivorous.
Every time Vlad in Count and Countess is about to take a bite out of someone, he grins. The glimpse of artificially sharpened teeth serves as the victim's first and last warning.
Enobaria, one of the Victors from The Hunger Games, is infamous for having ripped out a Tribute's throat in the Games she won. Afterwards, she had her teeth sharpened to a point and inlaid with gold.
Candorville directly correlates the size of the fangs with the evil of whatever has them—Susan's dog even gets bigger fangs when it's being scary than when it's being friendly. It's uncertain whether this is an artistic conceit or something else, given that the dog is apparently an evil shapeshifter, as is every fanged humanoid that has changed its fang length at one point or another.
The robot snake in Viper uses this to establish its menace.
Averted in Warhammer 40,000 by the Space Wolves, an army of boisterous bruisers who are about as close to good guys as the setting gets and are notable for having elongated canines. Since these grow longer as the Wolves get older, their veterans are even known as Long Fangs.
Also averted by the Blood Angels, who have fangs as part of their vampire motif and are also among the nobler Space Marine chapters. Unless they hit the Black Rage, in which case things can get...ugly.
In Ace Attorney Investigations, the Interpol agent Shi-Lang has sharp fangs to compliment his wolflike nature. He hates prosecutors, arrests people for little to no reason, and is a bit of a jerk to Edgeworth. However, he is presented sympathetically and even provides a Big Damn Heroes moment when he gets Alba's diplomatic immunity revoked.
Played straight with Furio Tigre, an intimidating and badly tanned loan shark who, through a Paper-Thin Disguise and everyone else being idiots, managed to actually impersonate Phoenix Wright because they had the same spiky hair.
Mortal Kombat's Baraka and Mileena! Baraka, as well as the rest of the Tarkatans, could send a shark running with a single grin. Mileena, a half-human, half Tarkatan Evil Twin of Kitana, inherits the hardware, though she keeps it hidden behind a veil.
Averted in the third installment of Star Control by the menacing but ultimately honourable Harika.
Ganon's bestial forms generally have large curved tusks, though he typically doesn't actually use them in combat.
The Unreal series has this in spades. In the first game, two of the three big time enemy alien species, the Skaarj and their bio-engineered heavy assault units, the Brutes, have tusks protruding from their lower jaws (the Skaarj's are particularly large). The only other mook species that fits their bill, the Krall, have quite a nasty set of them by the time Unreal Tournament III rolls by.
Richard of Looking for Group seems to have fangs under that cowl of his, if the x-ray vision we were treated to by troll shamans in an early page is anything to go by.
Yigs in The Water Phoenix King have small fangs that protrude from the lower jaw, but despite this and other traditional Orcish attributes, they aren't any more Evil than humans or other races in this setting.
Zimmy in Gunnerkrigg Court has her mouth full of jagged, sharp teeth. She has a hostile, insensitive personality, but she's hardly evil, making her something of an aversion.
Lower caste orcs from Fairy Dust have their tusks ripped out to make their low status visible. The adult males who still have their tusks can be assumed to be combattive enough to maintain their high position.
Scourge was supposed to have fangs, if one of the early scripts of Transformers: The Movie is any indication. In some scenes in the Season 3 episode ''The Burden Hardest To Bear", it does look like he has fangs, especially when Broadside is holding him.
Ravage, on the other hand, has always been shown as having fangs. He is a robotic panther, after all.
Demona from Gargoyles. Strictly speaking, all gargoyles have fangs, but Demona really enjoys showing them off, and she's evil.
Discussed in a sort of Fantastic Racism sense in ReBoot; Mouse is suspected of several abductions in one episode, and another character denies that it has anything to do with the fact that she's got fangs.
Megabyte and Hexadecimal also have fangs. Megabyte's fangs are hard to notice until he drops his Faux Affably Evil persona and starts acting like the vicious predator he is. Hexadecimal's fangs only appear when she switches to her Nightmare Face.
El Supremo has these, seemingly for no other reason than that he's evil.
These, along with every other part of his look, make Machestro from Xyber 9 New Dawn seem rather cat-like.
First played straight, then subverted on Adventure Time. Marceline and the Ice King both have fangs, but Marceline is only a villain for one episode before becoming friends with the main characters. The Ice King, meanwhile, is eventually revealed to have been a human antiquarian who had his mind warped by an Artifact of Doom. So he turns out to be more misguided and oblivious than evil, and we later see that he had the fangs even when he was more unambiguously good.
Thunderstick. It severely laps into CuteLittleFangs...ehm, YOU tell him that. (Interestingly, no image of Vipra with snake fangs could be found.)
Subverted in that Humans have the smallest, dullest canines of all our primate brethren but that does not make us less devious or dangerous. The change is related to our decreased reliance on biting things and increased reliance stabbing things with pointy objects and then setting them on fire. We still bare our teeth as an expression of anger, but without the fangs it's just not the same.
Cats are known to have fangs. Whether that makes this a subversion or a played-straight example is up for interpretation.
Dogs too. They are canine teeth, after all.
In general, any animal with fangs is much more likely to eat you. Small animals with fangs tend to be venomous at least often enough for it to be a safe, albeit not always correct, assumption that anything with fangs is venomous.
The Reptiles Are Abhorrent trope page notes that writers tend to draw all reptiles as villains, except turtles. It can't be a coincidence that many reptiles have fang-like teeth - except turtles, who are toothless.
Gorillas are a notable aversion. Despite their large fangs, they are completely herbivorous, and quite docile.