http://tvtropes.org/pmwiki/pmwiki.php/Monster/SwordArtOnline

"Let your fear carve one name into your brains, the name I share with this weapon: Death Gun!"

Johnny Black: Let's play the game where they have to kill each other! Last one standing wins!

PoH (no angel himself): I know it's your favorite but last time we did that you killed the winner anyway.

Johnny Black: Oh come on! You spoiled it! It's no fun if they know they're gonna die!

Advertisement:

The various games making up the Sword Art Online universe are home to some rather irredeemable villains.

Nobuyuki Sugou/Oberon the Fairy King is the director of research and development at RECT Progress Incorporated, former classmate—and the one-time fiancée—of Asuna Yuuki. Obsessed with research into the manipulation of human emotion and envious of his classmate Akihiko Kayaba. Following the clearing of Sword Art Online, Sugou trapped 300 of the surviving players in his own game, Alfheim Online, where he ran experiments on their minds, testing their fear and pain responses. Kidnapping Asuna in the game, he keeps her trapped in a gilded cage at the top of Alfheim's World Tree, while plotting to wed the comatose girl in the real world. When Kirito reaches the top of the World Tree, Sugou uses his administrator abilities to paralyze him, tortures him, and then sexually assaults Asuna in front of him, gloating the entire time about how, once he's freed, he will rape her again in real life. When he fails, he attempts to kill Kirito in the real world, attacking him with a knife. Mentioned again in Alicization, it is shown that Sugou put spies inside the Ocean Turtle with the intention of selling their AIs to foreign governments as he wanted to do with the results of his own experiments. A megalomaniac obsessed with his own glory, Sugou lack any of the virtues of his former classmates.

Advertisement:

Phantom Bullet Arc

Shoichi Shinkawa/Red Eyed XaXa is one of the top members of the Laughing Coffin Guild in SAO, and the Guild's Master Swordsman. During the Murder Investigation Arc in SAO, XaXa, alongside PoH and Johnny Black, ambushed and attempted to murder players Caynz, Yolko, and Schmitt; when Kirito intervened, the trio also tried to kill him. After making his way back to the real world, XaXa, bored and seeking a way to kill again, took advantage of his younger brother Kyoji's fragile mental state, to convince Kyoji to create the online persona of Sterben/Death Gun in Gun Gale Online, ultimately hijacking Kyoji's desire to be "the strongest" for his own ends. Using Kyoji, and his old partner Johnny Black as aides, XaXa was able to arrange the murders of players Tamotsu Shigemura/XeXeed, Tarako Usujio, Pale Rider, and Garret, before sending Kyoji to murder his own crush, Shino Asada. A sadist at heart, XaXa makes a point of crippling his opponents' avatars with a paralyzing toxin before delivering the coup de grace, and during his sword fight with Kirito in GGO does his best to cut him to ribbons, mocking him the entire time.

Advertisement: Atsushi Kanamoto/Johnny Black is another top member of the Laughing Coffin Guild. As the Guild's Master Poisoner, Johnny came up with a way to paralyze opponents so that they could then be tortured to death, and puts this poison into effect during his, XaXa, and PoH's attack on the members of the Golden Apple Guild. When discussing what they will do with the captured trio, Johnny expresses a desire to make them fight each other to the death, promising to release the survivor; when PoH notes that Johnny will just kill the survivor, Johnny complains about how the Guild Leader has ruined the surprise. He subsequently tries to poison Kirito when he comes to the Golden Apple trio's rescue. Escaping into the real world, Johnny was recruited by XaXa during the Death Gun murders, poisoning Pale Rider and Garret in their homes, before again making a getaway. He was finally arrested when, after having lain in wait for six months, he attacked Kirito and Asuna on the street, intending to inject them with poison from a syringe, and hospitalizing Kirito.

Alicization Arc

Progressive