Blade: Blade is pretty damn handy with, you guessed it, blades. Tossing his daggers down the barrel of guns or pinning people to walls by their clothes is a breeze. When sneaking up on a vampire about to bite a woman, Blade threw a stake that knocked the vampire's teeth clean out of his mouth! And Blade claims he can amputate insects with his knives.
Cable & Deadpool: In an early issue, while Wade (Deadpool) is casually conversing with Nate (Cable) about how he no longer feels the urge to kill, he rolls a pebble around between his fingers. When Nate's not looking, he lets it fly and nails a dragonfly so that the pebble knocks the body dead-center, leaving the wings on either side. (Really.)
Captain America: Cap's ability in throwing his shield to hit multiple targets by means of ricocheting, and still come back to his grasp. Though, in early issues of the Avengers, the "coming back" part was explained by little magnets on the shield and on his gloves. This was later retconned into simply being the product of lots and lots of practice; when John Walker was brought in to replace him as Captain America, it took weeks of training with the Taskmaster for him to even be able to throw it reliably; he never figured out how to get it to ricochet or hit multiple targets or come back to him after being thrown. Tony Stark later noted how embarrassed he was for bragging about the magnets he'd put on Cap's shield, and how Steve was enough of a gentleman to never say a word about it. The only other person who could match Steve's ability with the shield including the ricocheting is Hawkeye.
Bullseye, the Psycho for HireProfessional Killer who serves as the Arch-Nemesis to Daredevil, who mixes this with a physics-defying ability to propel projectiles to turn a variety of mundane household objects into Improvised Weapons. Among the objects Bullseye has used to kill people: paperclips, playing cards, golf balls, orange pits, a ballpoint pen, a toothpick, a salted peanut, and one of his own teeth. He rarely stoops so low as to use an actual gun.
Taking it up to eleven, one comic has him saying that the prison he's in has him on stool softeners and a liquid diet for fear that if he has a solid BM, he'll weaponize that. And he would, too.
Putting this through Serial Escalation to make an awesome moment is a two-part mini-series called Bullseye: Perfect Game. The series revolves around the fact that Bullseye is so bored, he takes an entire year off to kill one guy in the most spectacular fashion possible. The target is a baseball player, so Bullseye becomes a pitcher. When their teams face off, Bullseye creates a perfect game, by clipping his own team beforehand (in ways ranging from throwing a speck of dirt into an eye to cause an infection to killing someone with a thrown battery) and striking out every batter so the score is 0 to 0 in the last inning, with his target about to strike out. Too bad the umpire called the last pitch a ball.
In Sinister Spider-Man, Bullseye uses a yapping dog to the eye to distract Venom. Even more amazingly, the dog lived afterwards.
Interestingly enough, Daredevil points out that one of the main reasons he is able to survive so long with such an enemy is that when somebody "never misses" it becomes easier to predict their shots and where to block or guard when mixed with his own senses.
Daredevil himself gets in on the action when he hurls his Billy clubs, often taking down multiple mooks and hitting a switch on the wall with one throw. He's even better with arrows and guns, which have the extra advantage of being designed as ranged weapons.
In the Hawkeye and Mockingbird series, Hawkeye fired three Pym Particle arrows — arrows whose heads were capsules filled with dozens of toothpick-sized arrows that were treated with the chemical Ant-Man uses to get bigger/smaller. When they deployed and expanded, the thugs they were facing got to fight in the shade. Every single one was taken down non-fatally. Hawkeye simply said he never hits what he wasn't aiming for. This was during a motorcycle chase.
Not to mention in the alternate future Old Man Logan, where Hawkeye is blind, yet just as good, managing to get three gangsters in the mouth with three arrows just by listening to where they are.
Marvel: The Lost Generation: Oxbow is capable of hitting his target every time — including the time he went to the moon, where it took him exactly one arrow to get accustomed to the different gravity!
New Mutants: Resident Action Girl Dani Moonstar, with her arm broken, uses her one good hand and her FOOT to shoot her tormentor in the throat with an arrow.
Runaways: Kid Twist, a particularly slimy individual from Joss Whedon's run, has this as a power: once he sets eyes on a target, he never misses. This includes casually firing his gun behind him and having the bullet turn corners.
Hawkeye is an expert marksman who chooses to use a bow because of the challenge. He was shown to be deadly with anything he could throw, even killing a room full of armed guards while strapped down to a chair by flicking his fingernails. (He did mention at some point that it was not only practice, but that his vision was artificially enhanced.) At one point he runs out of arrows and starts shooting piece of rebar at people. It's such typical behavior that no one even mentions it.
Black Widow also has this power, as she's a Cyborg.
Wolverine: Wolverine has demonstrated this by first throwing a dart, and hitting a perfect bullseye, turning away from the dartboard and sitting down at a table, throwing his remaining two darts behind his shoulder, where they both managed to hit the bullseye as well. When challenged to get 3 bullseyes again, he stood up and stacked the darts on each other. He has also thrown a katana with his left hand (he's right-handed) at an attacking stuka plane, hit the pilot in his side, causing him to crash and burn. He has said that he can put six shots through a quarter, and still have change left for a gum machine.
X-Force: Domino, a not-too-picky mercenary who ended up joining up with Cable and X-Force, takes this trope literally. Her mutant power is to subconsciously alter probability in her favor, so if there's a trillion-to-one chance of her making a shot, she's going to make the shot. Any time she misses is due to an outside force affecting the bullet after it's fired, or her target being just that fast.
X-Men: Since Cyclops is using Eye Beams, you'd expect him to have very little trouble hitting whatever he can see. That doesn't explain his ability to pull off such shots as precision-stunning Professor X after ricocheting the beam around three corners or destroying six fast-moving targets, at least two of them behind him, with a single shot. It's been officially stated that Cyclops's mutant ability includes an intuitive knowledge of how to ricochet his own optic blasts. In old comics, this was attributed to his spending most of his training time in the Danger Room practicing how to pull off ricochets and other trick shots with his eyebeam. It even joked that he's one hell of a pool player. The X-Men Noir series recasts him as an ace gunman, thus having him play out a more typical version of this trope. Not only that, but he's an actual Cyclops, sporting a possibly blind, possibly glass left eye.
