Feedback (Ben 10 Omniverse) is considered Ben's favorite alien and has defeated most of Ben's foes and has more wins than losses.
You heard her (WildStorm/DC Comics).
Mister Terrific vs. the Ku Klux Klan (DC Comics)
Wonder Woman (DC Comics) vs. The People's Republic of China military
Batman (DC: New 52) teaches a valuable lesson to Green Lantern
There's a reason why he's called Invincible (Image Comics).
The Punisher's (Marvel Comics) got your nose.
Driving with Daredevil (Marvel Comics)
Wolverine (Marvel Comics)...
... goes fishing...
...doing what America couldn't...
Storm (Marvel Comics), the OG knife fighter of the X-Men.
Judge Dredd (2000 AD) is your judge, jury and executioner if need be.
Marco Diaz (Star vs. the Forces of Evil) is a student in the Tang Soo Do discipline of karate and, as of the eponymous episode, has a red belt. He can use karate with potentially lethal force as demonstrated when he cuts off Tom's hand with a karate chop and punches a hole through Toffee's chest.
The Hateocracy (Boondocks) is a gang of elderly, nasty, self-hating racist bigots and most of the badass n-words of this side of the world. If you're unlucky enough to crossed paths with them you better hire yourself an entire army to fight against them.
Adam Brashear/Blue Marvel (Marvel Comics)
Even without his working clothes, Peter Parker (Marvel Comics) is an absolute hero.
Tim Drake, everybody!!
Dark Danny/Dan Phantom (Danny Phantom) is single handedly the most powerful ghost on the planet that he destroyed even the Ghost King himself and ravage all of the world himself in just 10 years. He easily dominated over his younger counterpart Danny Fenton/Phantom in their battles if the latter didn’t received the Ghostly Wail in their final battle
Sosuke Aizen's (Bleach) power and fighting skills allow him to defeat the strongest Shinigamis, even Genryusai Yamamoto with his tactical genius.
Genryūsai Shigekuni Yamamoto (Bleach) was considered to be the strongest Soul Reaper in existence for the last millennium. Even without his powers, he could still obliterate a powerful Arrancar with his bare hands.
Kenpachi Zaraki (Bleach) is one of the most badass Shinigami, able to defeat almost any opponent with sheer strength and determination. He is badass to the point that when a reality warper tried to make himself more badass than Kenpachi, he found that this was literally impossible.
Guts, the Black Swordsman (Berserk) is the absolute master of his fate.
Son Goku (Dragon Ball series) is most famous for overcoming any obstacle, no matter what, through sheer determination and hard work; culminating in him reaching a state of being beyond even gods.
Vegeta (Dragon Ball series) has pulled many badass feats, but his crowning achievement comes from defeating a God of Destruction through sheer determination.
Vegito (Dragon Ball series) is the fusion of Son Goku and Vegeta, and therefore is one of the most badass fighters there is by default.
Broly (Dragon Ball Super)
Issei Hyoudou (Highschool DxD) as Diabolus Dragon Form.
Like most Abnormals, Medaka Kurokami (Medaka Box) can achieve incredible feats, such as catching a cascade of bullets with her mouth.
Germany (Axis Powers Hetalia) can break a spoon with his bare hands, along with other things.
Jonathan Joestar (JoJo's Bizarre Adventure Part I: Phantom Blood)
Jotaro Kujo (JoJo's Bizarre Adventure) is an extremely cool individual, able to keep his composure in even the direst of situations. A gambler trying to steal your soul? An evil assassin holds your granddad as a hostage? An immortal vampire trying to kill you? CALL HIM.
The Joestar Group (JoJo's Bizarre Adventure Part III: Stardust Crusaders)
Saitama (One-Punch Man) vs. the…never-mind.
Raizo (One Piece) is an awesome ninja.
The Worst Generation (One Piece) are the 12 most powerful and fearsome pirates of the modern era who are regarded by the World Government to be their worst nemesis for the immense chaos and disorder they have caused against the world…
…Capone Luke "Gang" Bege, the genius master tactician of the Fire Tank Pirates who has defeated the most powerful enemies with his tactical genius alone…
…Trafalgar D. Water Law, the captain/doctor of the Heart Pirates who is feared as the Surgeon of Death…
… the Magician Basil Hawkins the oracle leader of the Hawkins Pirates…
…the Roaring Tide Scratchmen Apoo, the DJ musician/captain of the On Air Pirates…
…the sadist daredevil captain of the Kid Pirates, Eustass "Captain" Kidd…
… Monkey D Luffy, the youngest of the Worst Generation who has miraculously committed numerous near-impossible feats that have shaken the Three Great Powers of the world to the core…
… "Blackbeard" Marshal D. Teach, Captain of the Blackbeard Pirates, who has achieved what no one else could ever do, overthrow Whitebeard one of the Yonko of the New World, steal his Gura Gura no Mi powers and take over his position as one of the Yonko.
The Straw Hat Pirates (One Piece)
Donquixote Doflamingo (One Piece)
Edward Newgate/Whitebeard (One Piece) truly lived up to his reputation as "World's Strongest Man"...
...Even in his advanced age, ill and far from his prime, it still took to eventually kill him.
Kaido (One Piece), without any doubt, truly lives up to his reputation as The Strongest Creature in the World.
Charlotte Katakuri (One Piece) is a legendary figure amongst the Big Mom pirates for his sheer badassery, skills, and professionalism. Having never lost a single fight from the day he was born until he was finally defeated by Monkey D. Luffy, Katakuri was the rock that held up the Big Mom Pirates.
Fairy Tail Gulid members (Fairy Tail) overcame tough trials making them very famous among other guilds, if not the most famous one and is feared of their strength and their accomplished goals. to the point of defeating the immortal Zeref.
Rising from his position as a lowly merchant, Ryo Fui (Kingdom) dominated the entire State of Qin.
Ei Sei, 31st King of Qin (Kingdom)
Ri Shin (Kingdom) has done the very impossible for somebody who was originally a servant and a slave. Killing over 20 enemy soldiers, destroying a war chariot he never saw before, diving headfirst into a sea of enemy soldiers just to save his fellow squad mates and killing an enemy general just on his first campaign.
Ou Ki, the Monstrous of Qin (Kingdom) was one of the most dominant military figures of his era, numbering victories on the battlefield against many formidable foes. At the time of his death, there was not a single general as hated by the masses as him and was rumored to be the strongest of Qin's Six Great Generals.
A genius prodigy at warfare, Kan Ki, the Beheader (Kingdom) has never even formally studied strategy yet has never lost a battle due to his unique unorthodox tactics. Just by dedicating an entire day of doing nothing he was able to throw everybody, even own allies, off just to bait and lure the enemy commander out of hiding (not to mention pissing everybody off, too).
Ri Boku of the Three Great Heavens (Kingdom) is a Great General of the Heavens from the State of Zhao before he made a name for himself he was mostly known for subduing the Xiongnu threat to the north which constantly raids the northern part of Zhao, a feat which no other Zhao general had achieved before.
Hou Ken, the Bushin (Kingdom) is considered a walking manifestation of calamity and violence.
Ou Hon (Kingdom)
Ou Sen (Kingdom)
Since he could walk as a child, Kenshirō Kasumi (Fist of the Blue Sky) has been described as the Greatest Martial Artist in the world. Crippling or killing any opponent he would fight which eventually earned him the moniker of Yánwáng/The King of Death.
Kenshiro (Fist of the North Star) is ultimately regarded as the world's strongest man. His mastery of the greatest martial art the globe, The Hokuto Shin Ken (Big Dipper God Fist), has garnered him titles such as the Savior of The Century's End.
Gintoki Sakata (Gintama)
Escanor, the Lion's Sin of Pride (Seven Deadly Sins) is the strongest human alive, and he knows it...
...and at his pinnacle of power, he is utterly invincible...
...even able to face the Demon King on equal footing.
He wasn't meant to be great because of his fate as an F-rank, but Ikki Kurogane (Rakudai Kishi no Eiyutan) has beaten the odds against him, trumped over the common sense that said he couldn't and told his fate that it wasn't the boss of him as he always had.
Team Bucciarati (JoJo's Bizarre Adventure Part V: Golden Wind/Vento Aureo)
Barney Stinson (How I Met Your Mother) has gone past what is possible, to the place where the possible and the impossible meet to become... the possible.
Zohan (You Don't Mess with the Zohan) uses his power in the most badass ways, such as folding his enemy to pretzel or putting piranha in his swimsuit.
Mr. Smith (Shoot' Em Up)
The MacManus brothers, Connor and Murphy (Boondock Saints films) can simultaneously fire two Desert Eagles without recoil, seem to have unlimited ammo and survive against all odds by pulling off seemingly impossible feats that border on dumb luck.
Ashley J. Williams (The Evil Dead series) has survived countless demonic related events, time-traveling to medieval times, demonic possession, and fighting his evil clone.
Asura (Asura's Wrath) defeated and killed the nigh-omnipotent creator deity of his world using nothing but his unyielding rage and determination to save his daughter.
Kratos (God of War) single-handedly wiped out the entire Greek pantheon in his thirst for vengeance.
Grayson "Gray" Hunt (Bulletstorm), the epitome of badassery, foul language use and dumbass revenge seeker.
Juvie (Valkyrie Crusade) is a badass.
Various human characters such as Leon Scott Kennedy (Resident Evil franchise) can perform difficult acrobatic feats and survive insurmountable damage that would be fatal to normal people.
The Doom Slayer (Doom) is a relentless beast of a soldier capable of slaughtering the Titan, Icon of Sin, Cyberdemons and the god-like Khan Maykr as well as take on the entire legions of Hell singlehandedly, earning him such titles as Hell Walker, Bane of Hell and Unchained Predator.
John-117 (Halo) is considered to be the most badass (and lucky) Spartan II Supersoldier. His skills have earned him the reputation of "The Demon" among his foes.
Arbiter Thel 'Vadam (Halo) is one of the few beings in the galaxy to rival John-117 in badassery.
Dante (Devil May Cry series) has pulled off countless awesome feats...
...destroying demons in a friendly game of Billiard.
Vergil (Devil May Cry) is so awesome, he is known as the Dark Slayer.
Commander Shepard (Mass Effect) is one of the greatest warriors in the Milky Way, acknowledged by the likes of Urdnot Wrex, Javik, the Reapers, and the Catalyst.
Duke Nukem (Duke Nukem franchise) kicks alien ass and looks good doing it.
Not only can Weird-Ass Guitar Guy (Channel Awesome) play a multi-necked electric guitar that can shoot dinosaur missiles, but he wears a blindfold because his body is full of so much testosterone that his eyes literally shoot shark-shaped explosions.