Seijiro Kikuoka

Kikuoka Seijirou (菊岡誠二郎), known as Chrysheight (クリスハイト) is a supporting character in the Phantom Bullet Arc and Alicization Arc, as well as a reoccurring character throughout the Sword Art Online series. He allegedly works for the Ministry of Internal Affair's Telecommunications Bureau, Advanced Network Division, Second Office (the «Virtual Division») and, at some point after the end of the Sword Art Online incident, began playing ALfheim Online for research purposes. However, Seijirou is actually a Lieutenant Colonel of the Japan Ground Self Defense Force, who voluntarily transferred over to the Ministry of Internal Affair's Telecommunications Bureau for the sake of his plans on Project Alicization.