Kikuoka Seijirou

Kikuoka Seijirou (菊岡誠二郎) is a member of the Ministry of Internal Affairs and Communications, Technology, Second Separated Advanced Network Division, or «Virtual Division». He uses the handle Chrysheight (クリスハイト) (formed from the English words «Chrysanthemum» and «Height» ) in «ALfheim Online». He supposedly uses this account to get more familiar with VRMMO players, but Kirito speculates that the true reason for using this account is to gather information. It is later revealed that Kikuoka is actually a Lieutenant Colonel working at the JSDF who voluntarily transferred over to the Ministry of Internal Affairs and Communication for the sake of his plans on Project Alicization.

Background
He was an investigator in the «Sword Art Online Case Victims Rescue Force», and the one who told Kirito which hospital Asuna was in. Though he is stated to be part of the virtual division, Kirito suspects he is part of the JSDF, after tailing him. He takes advantage of Kirito's gratitude by using him as an investigator for issues, and uses other people like watchdogs over the VR network.

His skill as a mage in ALfheim Online is acknowledged by General Eugene.

He was also one of the original 1,000 beta testers for the original Sword Art Online. However he did not transfer over to the full version of Sword Art Online because he realized that the technology could be used for more than just military training programs and started working on Project Alicization.

Phantom Bullet Arc
Kikuoka Seijirou makes his first appearance in Volume 5 as an acquaintance of Kirito, contacting Kirito for advice concerning a troubling matter. He introduces the Death Gun problem, trying to debate on how Death Gun can kill through the tamper-proof safety conscious AmuSphere. He and Kirito reason that such a feat is impossible, but he convinces Kirito to investigate for a sizable fee.

After Kirito enters the «Bullet of Bullets», Asuna tracks down Kikuoka's avatar in ALfheim Online and interrogates him to find out Kirito's true purpose for converting to Gun Gale Online. He, after extreme pressure, reveals everything to Asuna.

In the resolution, he meets with Kirito and Asada for a debriefing of the incident and apologizes for the danger. Kirito also makes the suggestion of the dangers that some aspects of VRMMO pose, such as invisibility being a gateway to misbehavior.

Alicization Running
In Alicization Running, it is revealed that he is a Lieutenant Colonel from the Japanese government's Self-Defence Force, and is in charge of the Alicization Project. He oversaw its conception and formulation, directing the soul cloning of newborn babies and then the acceleration of the Underworld society.

It is also revealed that he took advantage of the «GGO Incident» to form a relationship with Kirito. His true goal is revealed to enlist Kirito to the Government's Self-Defence Force.