I don't have a manga to add, but I sure do have another literary heart-throb to add: Captain Wentworth from Jane Austen's Persuasion. That man can surely write a sweet letter that surely made my heart melt...

MAY CONTAIN SPOILERS!

The character style is called the Byronic Hero. Here's some manga/anime with that character style:

Guts from Berserk is a notable example of this trope and fits most of the classical traits. He spent the years after the Eclipse wandering from town to town and killing Apostles, largely indifferent to the people he saved and hanging onto his humanity by a thread. However, he eventually starts to return to his original personality after he sees where his obsession with revenge has left him.

Manipulative Bastard Lelouch Lamperouge from Code Geass is massively arrogant, generally has no trouble with slaughtering his enemies, is fairly vengeful and frequently lies to and keeps secrets from his own men, as well as his friends and family. The universe has screwed him over a couple of times. While Lelouch sincerely wants to make the world a better place, many of his methods are so devious and underhanded and his motives behind his actions are so self-serving that it's impossible to call him any other kind of hero. The director said he specifically chose Jun Fukuyama to voice Lelouch on the grounds that his voice, along with the character's traits, would make him such that the viewer would side with him no matter what he'd say.

Suzaku also counts. Terrible, unmentioned crime haunting him? Check. Constant angst over that crime, to the point of becoming self destructive? Check. Passionate, with a willingness to sacrifice anything to his passions? Check. Conflicting emotions (regarding his devotion to his goal vs. his perceived duty to his people)? Check. Outcast? Check. A woman he loved, with the relationship ending in a manner which overshadowed his actions for the rest of his life? Check. To be more exact, he tries sacrificing himself under the guise of chivalry to both Britannia and supposedly Japan as an excuse to fulfill his death wish, but mostly serves to derail Lelouch's plans before they would otherwise bear maximum results. In season 2, he becomes even worse, descending into Knight Templar territory and conquering EU nations for Schneizel. He does eventually join Lelouch, but not before they're both broken beyond repair.

Mello from Death Note.

Alexander Row of Last Exile is a pretty good example of a heroic version. He's Tall, Dark, and Handsome, an officer and captain of his own one of a kind Cool Airship, which he essentially stole from the government and is operating on his own, outside of the law. He is stoic, withdrawn and brooding (half the time when we see him, he's just sitting in the dark alone), doesn't really listen to a damn thing anyone else wants him to do and is driven by revenge and revolution. He's also an expert strategist with a crew that will follow him anywhere. He has a troubled past that is revealed to include a dead wife. The princess is also in love with him, and it's doomed to be unrequited. Oh, and he's a total badass.

Vegeta from Dragon Ball Z often fits this trope.

Roy Mustang from Fullmetal Alchemist and the 2003 anime version of Edward Elric.

As does Sasuke Uchiha of Naruto.

Alucard of Hellsing.

Shinn Asuka from Gundam SEED Destiny, whose hate of ORB brings him much suffering.
The Celestial Being organization in Gundam 00. True, they are no saints, but what makes them the heroic figures is their sincere awareness of how the world suffers from endless warfare, and they put their effort to end them by force.

Villain Protagonist Edmond Dantes from Gankutsuou is a villanious example of this trope. The main character is the eponymous character from The Count of Monte Cristo, Recycled In Space.
Hiei of Yu Yu Hakusho.

Gendo Ikari of Neon Genesis Evangelion, and Rebuild of Evangelion, as well as Shinji to a slightly lesser extent.

Werner Locksmith from Planetes. A genius engineer and businessman, he is a total sociopath who by his own words "can love only spaceships". He truly wants to bring a better life to humanity, but his emotional detachment makes him the epitome of the Well-Intentioned Extremist, as he firmly believes that Utopia Justifies the Means.

Homura Akemi of Puella Magi Madoka Magica.

Sesshomaru and, prior to Character Development, Inuyasha of InuYasha.

The eponymous Haruhi Suzumiya.

The eponymous Afro Samurai.

Same with, the eponymous Soul Eater.

Revy and Roberta from Black Lagoon.

The passionately loyal and incurably self-destructive Reuental from Legend of Galactic Heroes. Yeah.

Joe Yabuki from Ashita No Joe goes through many hardships.

source: http://tvtropes.org/pmwiki/pmwiki.php/Main/ByronicHero

Hrm... The only one I can think of is Miketsukami from Inu x Boku SS maybe...?

Before meeting Ririchou, Miketsukami was one of those upper-class, sheltered kids who never had contact with any body. He felt really lonely/wanted freedom so he started having relationships with lots of women. He then met Ririchou and decided that he really liked her. The scans isn't really up to the chapter yet, but in chapter 9 or 10 you can see that he really is "wuv-bear with a heart of cotton-candy" XD

Quote from Mo-Dean

Man, Colonel Brandon is so much better than any of those guys.

Agreed 😀

KanataxYuki will always remain in my heart...
Their love is so profound~!
CrangolaFango

Flowers of Evil seconded. IMO he's a mixture of all four.

Kieli. Harvey is almost Darcy-ish with a bit of Heathecliff sprinkled on top. He's kinda Mr.Rochester-ish <3

Omg I just can't help but comment. I'm only 13, but I have a taste for classic literature. I read those four books in this order: Phantom of the Opera, Pride and Prejudice, Wuthering Heights, and last month I finished Jane Eyre. I loved all four and I often find myself rereading them every once and a while. My favorite out of all is Pride and Prejudice, of course, mostly because some parts of Jane Austen's work absolutely moved me, like this quote:

In vain I have suffered. This will not do. You must allow me to tell you how ardently I love and admire you

I love this quote. It always gives me butterflies... And makes me think of my crush XD

I am vindicated!
I am selfish;
I am wrong!
I am right,
I swear I'm right.
Swear I knew it all along
And I am flawed!
But I am cleaning up so well
I am seeing in me now
The things you swore
You saw yourself...

~"Vindicated" by Dashboard Confessional

SAKUYA!!! Sakuya from Kaikan Phrase...does he count? He is soooo hot. If I met him face-to-face I would probably pass out. -hot-cool-cold-dark past-..... Oh god I just finished manga for xxx-time, but oh well 🤨 anime is waiting!!!!(xxy-times)

I'm.....rude, ill-mannered, thick-skinned, slow-witted, hasty, gloomy, sulky, malicious, sarcastic, slothful, gross, lethargic, cheeky, sly, satirical, pretentious, shameless, two-faced, unreasonable, heedless, foolish, annoying,...Creepy freak

[img]http://fc01.deviantart.com/fs21/f/2007/305/b/1/No_Yaoi__by_AlucardSlave.jpg[/img] Nooo
http://myanimelist.net/profile/vampirio18