Hosaka Carina Tomo

Argo (アルゴ) is a «Sword Art Online» beta tester who sells information between players. Kirito often looks to her for her skills.

Appearance
Argo has brown eyes and hair. She wears a hooded cloak. She also have whiskers on her face, which was originally a mark from a quest but now a makeup of her choice.

Sword Art Online
Argo is first introduced as the beta tester who serves a middleman between Kirito and a prospect buyer of his «Anneal Blade +6». She was later revealed to have anonymously  assisted players by creating the guide book, «Strategy Guide by Area», a pamphlet freely distributed in NPC shops. Inside are hunting locations and other resourceful information pertaining to staying alive in the game.

She is willing to sell any information except names of SAO beta testers. She also serves as a middle-man of player dealings.

Argo's whiskers were originally a mark written on her face when she tried to complete the quest that awards the "Martial Arts" extra skill. Unable to complete the quest, the mark remained on her face throughout the entire «SAO Closed Beta». She reapplies a similar makeup on the official server service.

Trivia

 * Argo is one of the few players in SAO who have a nickname for Kirito. She likes to call him, "Kii-bou".
 * Argo was Kirito's second ever contact on his friend list (after Klein)