Afasys

Afasys(JP) (アファシス) or ArFA-Sys(West) is an original Sword Art Online game character. Afasys is a rare type, modeled Type-X, of an AI companion called Artificial Financial Adviser System to the Protagonist in Sword Art Online: Fatal Bullet. Afasys' full ID is Afa System Type-X A290-00 and is referred to by the main cast as Rei (零) due to the zeros appended to her Unit ID.

Gun Gale Online
Both female(canon) and male(alternative) versions of Afasys feature white and purple prominently as their canon looks. They both have purple eyes, white hair and a skin-tight suit that is designed to fit the theme of white and purple. While the female Afasys has short and straight hair, the male Afasys variant has short and messy hair.

Personality
As a Type-X Unit, Afasys features a distinct personality, unlike the other models. Afasys is clumsy companion that tends to make simple mistakes while taking care of a task and is very forgetful in terms of remembering key information. As an AI companion, their battle personality can be adjusted by the Protagonist to suit their needs based on various parameters. While Afasys' core personality traits are set in stone, how they express themselves can also be adjusted by the Protagonist to sound "Bright", "Stoic", "Cute", "Zealous" or "Serious".

With the addition of DLC1, Champion of Gunfire, situational emotes have been added as adjustable parameters that allows Protagonist to decide how Afasys reacts to certain events, such as waving when you meet a friend or pumping their fist up in the air upon leveling up.