What is good when there is no evil? The bad guys that you can't do without:

Hansel and Gretel (Black Lagoon)


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QUOTE(Wikipedia)
[spoiler]Hansel and Gretel are two unnamed Romanian identical twin orphans, suggested to be male and female, who were abandoned in a state-run orphanage due to the Nicolae Ceauşescu regime's ban on abortion. As a result of being repeatedly forced to participate in peadophilic snuff films in which they are either raped or forced to murder other children, the twins eventually became deranged, sadistic killers just to survive. Unknown to most people, "Hansel" and "Gretel" are actually two personalities alternately adopted by the two children, both of whom suffer from Dissociative Identity Disorder.

In combat, "Hansel" wields a sharp, wicked-looking battle axe while "Gretel" uses a M1918 Browning Automatic Rifle that appears to be taller than she is. Both also carry additional sidearms. While they were mentally deranged, Hansel and Gretel were also cunning, having used two other children as decoys to distract the "Hotel Moscow" ex-soldiers and using money to distract Eda. They were also not above using their innocent appearance to deceive their enemies.

As revenge for killing Balalaika's men, Hansel is shot from a distance and left to bleed to death in one of Roanapur's parks, while Gretel manages to escape and eventually boards the Black Lagoon of her own volition. Due to Rock's kindness, she begins to shed her psychotic personality and takes a genuine liking to him. However, just as Gretel starts to begin a normal life, she is gunned down by a South African hitman.

Within the story of Black Lagoon, Hansel and Gretel may be two of the most evil characters, as they live for nothing other than random, senseless acts of murder. However, they may also be the most tragic characters as they believe that these acts of violence will prevent them from being harmed by others.

The characters' names are taken from the German fairy tale, Hansel and Gretel. Many of the series' characters compare them to a similar pair of disturbed, sadistic twins from the American film The Shining.[/spoiler]


Fei Wong Reed (Tusbasa Chronicle)


Random Curiosity

QUOTE(Wiki)
[spoiler]A mysterious and powerful villain who is after Sakura's feathers. He is later revealed to be a direct ancestor of Clow Reed and well aware of the powers of the Dimension Witch. He was the one who imprisoned the "real" Syaoran and created the Syaoran who is the protagonist of Tsubasa. Though he already possesses the power to cross dimensions like the High Priest of Clow and Princess Tomoyo, he seeks the power of Sakura's wings, which surpasses the power of all who can cross dimensions, and the power that lies under the ruins of the Clow Country in order to "To bring back a dream that has already ended". He does not care on how much blood has to be shed to get that power; those he has killed (or arranged to be killed) include Kurogane's mother.

His true objective not to obtain Sakura's feathers; rather, the scattering Sakura's memories was to provide a motive that would force her to travel between dimensions to recover them and attain the physical memories Sakura gains through her powers as she visits various dimensions. Therefore the scattering of memories and having the TRC trio accompany Sakura on her journey was a pre-planned situation created by Fei Wong in order for him to attain his "wish".[/spoiler]


The Millenium Earl (D.Gray-man)


Memento

QUOTE(Wiki)
[spoiler]The antagonist who lures people with dead relatives and friends to produce Akumas. He plans to lead the world to its death. Currently, he has combined forces with the Noah family who call him "Duke Millennium". Hoshino [the creator of the manga] says she based the Earl of Millennium off a legendary alchemist/preacher (most likely the Count of St Germain) whose tale even claims he still may be alive somewhere. Interestingly, almost every one of the Earl's lines of dialogue ends with a heart. He has 2 primary personalities. The first is his normal cheerful, friendly, and happy attitude while the other is that of sheer sadistic malice. He also wears a different hat in each encounter, each with a different decoration...

His main form of combat involves his umbrella Lero. He has also shown the ability to create massive explosions of dark energy.[/spoiler]


The Puppeteer (Ghost in the Shell: Stand Alone Complex - Solid State Society


Cyberpunk Review - Images of The Puppeteer (if there are any) are hard to find, so mei had to make do. Note that the guy with a hole is his jaw is not the Puppeteer, but a manifestation of the Puppeteer's cyberbrain-hacking abilities.

[more information later]