Koichiro Yuuki

Koichiro Yuuki (結城浩一郎) known as Cordis (コーディス) in «Gun Gale Online» (GGO), ALfheim Online (ALO), is the older brother of Asuna Yuuki and would have been one of the 50,000 players to be trapped in Sword Art Online if he did not end up going on a business trip on the first day of the game's official server and is the deuteragonist of the Phantom Bullet Arc and one of the main characters in the War of the Underworld sub-arc of the Alicization Arc. He began playing Gun Gale Online when it first releases under to earn money for his living expense after choosing to move out of Family Home sometime after Nobuyuki Sugo arrest.

Real World / Project Alicization Avatar
Koichiro has Dark Brown Hair and he wears glasses.

ALfheim Online Avatar
Koichiro's Avatar

Gun Gale Online Avatar
Koichiro's Avatar has dark brown hair and black trench coat

Personality
Koichiro tends to act in cool collect is often cold, blunt, and reserved. He can acts a bit smug and is an arrogant man who tends to act extremely cocky at times. Despite this, He is a caring and friendly individual and cared highly for his sister Asuna and felt extremely guilty that Asuna was a trap in SAO in his place and has often visited her in the hospital. Due to the constant pressure of his Mother often tell him to achieve a successful career to which has caused a lot of stress, where he finally snaps and moves out to live alone.

Background
Koichiro attended a private school selected by his parents and consistently retained excellent results. 15 years ago while attending a wedding party.

He was later employed to work in his father's company, RECT Inc. Due to his connections, he was able to acquire a copy of Sword Art Online; however, he was called to an overseas business trip on the very first day of the game's official service, preventing him from trying the game on its first day. Because of this, Kouichirou agreed to lend his NerveGear to his sister for a single day, which resulted in her becoming trapped in the game for the following two years.

Trivia

 * Koichiro was first mention by Asuna when Kirito Renya Shuto and other start talking about their sibling