Kanamoto Atsushi

Johnny Black is a survivor of SAO and a member of the infamous red guild Laughing Coffin, he was partnered with Xaxa of the red eyes. He was well known for using poisons and the such in battle. His real name is Kanemoto.

Sword Art Online
In the timeline he appears during a Murder in the the Area incident along with PoH and Xaxa. Sometime after that incident the crusade is launched and he is captured along with others from Laughing Coffin.

Phantom Bullet
He serves as Xaxa's accomplice in the Death Gun Incident, and is not captured.

Alicization
He is also the one who stabs Kirito while he is stopped, he succeeded in hurting Kirito severely.