V3's Bobby Jacks, who after scoring a headshot on another student while his back was turned, was named 'Bocelot' (a reference to Revolver Ocelot) by other handlers, who joked about him killing other students with triple ricochet shots, scoring headshots from halfway across the island, and firing his gun and killing a student in V4 a year later.
Furthermore: Nobody killed Bocelot. He just got bored.
John Rizzolo is just your average player, except a little more cunning and a lot more sadistic. THE RIZ!, however, is so entirely badass that he creates cliffs from nowhere and drop kicks anyone he wants off of them. His Rizzlefandom on the SotF Rizwebsite has gotten to the point where Rizzlehandlers, often discussing entirely unRizrelated things, will add 'Rizzle' or 'Riz' to their words.
Lance Vanguard and Zack Dynamite, two rejected names for Characters in v4.
A rejected Troll profile gave us THE GODDAMN BUBBA DOVER. It was a Scary Black Man, with Blaxploitation tropes Beyond the Impossible. Rather than being annoyed, it backfired and the handlers of the board seized on this one instead, to the point where any mention of Badass characters is sure to mention him at some point or another.
Fans of Kilplix'sLeft 4 Dead vids will note that Con, despite usually just lighting his team (or mainly just Kilplix) on fire, has quite the fan base and is thought the be the definition of awesomeness. In fact, Con is so awesome, he could probably kill Chuck Norris with only one Molotov.
Proven in the Year 3 event... Suede kicked butt. No wonder Insano didn't show up.
In universe? SANTA CHRIST! SANTA CHRIST! WE ALL LOVE SANTA CHRIST!
"Shall I tell ye the stories of Blood Beard Joe?"
Malachite yet was already a badass in universe and it was proven to everyone when he let a car run into him and it exploded! He didn't even break his stride!
During the third Desert Bus for Hope charity drive Matt Wiggins turned down an offer for $500 if he wore eyeliner. Hundreds of ridiculous accusations were made about how evil Matt was, including that he invented Desert Bus, midichlorians, and canceled Firefly. Two public access Twitter accounts carried out the meme (Things Matt Did and Things Matt Did 2). He was eventually redeemed by a) promising to watch Battlefield Earth, and b) this.
The Pokemon-themed adoptable site GPXPlus has Cloysterman, a meme spawned from an entry in the site's Pokemon dress-up contest. If it punches you, you WILL die.
Felicia Day has a blog entry detailing the Tweets other people have made of these about her.
As of "Ashen Waste", Evan from Everyman HYBRID for going after him with a baseball bat, and the Hybrid crew in general for trying to "run the fucker down". Again, it didn't actually work, but points for effort.
Katherine Hillard is an in-universe example in Of Love And Bunnies, as most female space villains seem to not realize that her Heel Face Turn was genuine, and as such refer to her as the universe's greatest mole and seducer of the Universe's Greatest Ranger.
Ashly and Anthony's dad from Hey Ash, Whatcha Playin'? is the ultimate badass. Look at any of their videos on Youtube for confirmation, particularly Lips.
The titular Ninja of Ask a Ninja often makes astonishing claims about what he and other ninjas can do. Like how a ninja can go through a snowstorm without being hit by a single snowflake, or that they are faster than the speed of light. They are the speed of darkness. He also claims that he killed 4500 people in a day and that the Black Death was a ninja.
The Angry Video Game Nerd will take you back to the past, to play the shitty games that suck ass, even if he would rather have a buffalo take a diarrhea dump in his ear.
Anonymous has taken on cults, religions, and several national governments and won.
Bad Horse! He rides across the nation! The Thoroughbred of Sin!
Epic Meal Time: Muscles Glasses is definitely played up as this, culminating in coming Back from the Dead and winning a long series of arm-wrestles with various superheroes at Comic-Con.
Agents of Cracked brings us The Chief, who, among other things, eats lead and craps bullets(so his toilet gets all...shot up, when he poops), rides a triceratops to work, drinks tiger blood milkshakes for breakfast(MILKSHAKES, FOR BREAKFAST!), and personally knows Die Hard(Not Bruce Willis, Die Hard). Turns out he belongs to a pantheon of other such Chiefs, all of whom are equally badass(Up to and including sexually assaulting a mountain).