1 Wolverine
Wolverine is a fictional character appearing in American comic books published by Marvel Comics, commonly associated with the X-Men. His powers and abilities include a healing factor and his signature adamantium claws and adamantium skeleton. Although he has healing factors and adamantium bones, Wolverine can be pretty violent when he comes across his enemies in brutal fights. Even harder fights with Sabretooth.
2 The Punisher
The Punisher is a fictional antihero appearing in American comic books published by Marvel Comics. The character was created by writer Gerry Conway and artist John Romita, Sr., with publisher Stan Lee green-lighting the name. How the hell is he not in the top 3? He has a kill count in the thousands!
Why he's not number 1 will forever baffle me.
3 Joker
The Joker is a fictional super villain created by Bill Finger, Bob Kane, and Jerry Robinson who first appeared in the debut issue of the comic book Batman (April 25, 1940) published by DC Comics. Credit for the Joker's creation is disputed; Kane and Robinson claimed responsibility for the Joker's design,... read more The Joker is a totally insane psychopath that terrorizes Gotham with his wicked ways. He was also the one who killed Jason Todd and paralyzed Barbara Gordon. Even though he's one of the most dangerous beings in Gotham, he's our favorite psychopath in DC today.
4 Carnage
Carnage (Cletus Kassidy) is a fictional supervillain appearing in American comic books published by Marvel Comics, usually as an enemy of Spider-Man. He appeared for the first time in The Amazing Spider-Man #361. Cletus Kasady was once a serial killer. Now he's much more dangerous when he's infected by the Symbiote and becomes Carnage.
5 Invincible
If you think the Joker isn't violent enough, consider Image Comics' Invincible. This superhero fought his enemies in gory, gritty, and "hard to watch" scenes. We've seen arms torn off, intestines exploding, faces pounded, beheadings, and horrifying bone-breaking moments throughout his story. Read this series, and you'll see how bad and violent it gets.
I'm surprised you mentioned this because I did read the series. Only parts of the issues get violent as the fight goes on. I think the battle between Invincible and Conquest was the goriest, most painful, and gruesome fight ever in the series.
6 Rorschach
Rorschach is a fictional anti-hero who appears in American comic books published by DC Comics. He first debuted in the graphic novel Watchmen, published from 1986-1987. Rorschach was created by writer Alan Moore and Dave Gibbons. He split a guy's head with a meat cleaver in the Watchmen movie.
One of the coolest anti-heroes, and one of the most brutal!
7 V
8 Spawn
Spawn is a fictional character, an antihero and hellish Superhero that appears in a monthly comic book of the same name published by American company Image Comics.
9 Negan
Negan is a fictional character from the comic book series The Walking Dead and is portrayed by Jeffrey Dean Morgan in the American television series of the same name. The Governor wasn't that violent in The Walking Dead comic series, but Negan's psychotic ways made him the most dangerous character ever. He even kills Glenn with his barbed-wire baseball bat.
I can't wait for him to get killed. And I hope he suffers after everything he's done and all the innocent people he's murdered. This man has no soul.
10 Red Hulk
The Contenders
11 X-23
Laura Kinney, originally known as X-23 and later the second known Wolverine, is a fictional superhero appearing in American comic books published by Marvel Comics, most commonly in association with the X-Men. Laura Kinney may be one of the attractive mutants in X-Men, but despite being created as a living weapon by Weapon X, she gets herself into deadly situations when she claws her enemies to death. She even had her arm cut off, was burned to death, and had her legs mangled in the series. However, she does have a healing factor like Wolverine.
12 Deadpool
Deadpool is a fictional antihero created by Marvel who appears in their comics. Deadpool's first appearance was in New Mutants #98 by Rob Liefeld and Fabian Nicieza in February of 1991. His powers include self-healing and super strength. He is regarded as one of the funniest characters in comics due... read more
13 Cassie Hack
From the series Hack/Slash, Cassie's violent tales lead her to fight evil slashers along with her hulking partner, Vlad. There's much brutality in this comic series if you read them.
14 Venom
Venom, or the Venom Symbiote, is an alias used by several fictional characters appearing in American comic books published by Marvel Comics, commonly in association with Spider-Man.
15 Killer Croc
Killer Croc is a fictional supervillain appearing in American comic books published by DC Comics, commonly as an adversary of the superhero Batman.
16 Man-Bat
17 Sabretooth
Sabretooth is a super villain appearing in American comic books published by Marvel Comics, most commonly in association with the X-Men, in particular as an enemy of Wolverine. Created by writer Chris Claremont and artist/co-writer John Byrne, the character first appeared in Iron Fist #14.
18 Lobo
Lobo is a fictional character that appears in comic books published by DC Comics. The Lobo character was created by Roger Slifer and Keith Giffen, and first appeared in Omega Men #3. Lobo is an alien born on the utopian planet of Czarnia, and works as an interstellar mercenary and bounty hunter. Lobo is one of the most violent characters around. Not many characters are even close to this guy, other than The Punisher, who I would consider the most violent of them all.
19 Evil Ernie
20 Deathstroke
Deathstroke is a fictional supervillain appearing in American comic books published by DC Comics. The character was created by Marv Wolfman and George Perez. He is a mercenary and assassin who first appeared in The New Teen Titans #2.
21 Hooded Justice
22 Red Hood
The Red Hood is an alias used by multiple fictional characters and a criminal organization appearing in American comic books published by DC Comics.
23 The Mask
24 Bullseye
25 Professor Pyg
Professor Pyg is a fictional supervillain appearing in comic books published DC Comics, commonly as an adversary of the superhero Batman.