PoH is the leader and founder of the red guild "Laughing Coffin," known for his large knife and catch phrase "It's show time." His guild was later destroyed by other players in SAO, but his whereabouts are missing. He is presumed to be alive because he wasn't listed as one of the dead players. (Source: Sword Art Online Wikia)
Ronye Arabel is Kirito's valet who learns swordsmanship under him. She is the daughter of a 6th class Noble Family; like Tieze, she entered Sword Mastery Academy trying to raise her family status. She was one of the top 12 of her year, so she became a valet, but what she does not know is that Kirito did not choose her. Instead she was left along with Tieze after all other elite swordsmen selected their valets. The reason for this was that they were from the lowest Noble Class, so none of the noble elite swordsmen wanted to take them as their valets. (Source: Sword Art Online Wikia)
Argo "The Rat" serves as an information broker and courier in the Sword Art Online death game. Kirito and Argo suspect each-other to be a fellow beta testers but each refuse to ever confirm the topic. As a broker, she is known to sell any information for any price, including the story of her mysterious trademark whiskers. While she sells information to some at occasionally hefty prices, she is also known to be the author of free guide books situated in most town shops to help beginners. Argo's whiskers were originally drawn on during a quest to learn the "Martial Arts" skill during the beta test. Unable to complete the quest before beta testing ended, they became her trademark and source of her nickname.
Sword is possessing a weak human known as Souma. His main goal is to try to regain a new demonic body any way possible. As a human his demonic powers are limited to almost nothing. Later on he obtains helpful items such as bat cat, the devil spawn and fragments of Satan's soul. He also is currently attempting to overthrow Satan because Satan and most of Hell want Sword dead. For a low-level devil, Sword is stronger than most demons in Hell. Although in his human form, he always ended up in the hospital. [Source: Wikipedia]
A player with green-blue hair, sports a kite shield and proclaims himself to be a knight. He was the one who organized the first meeting of players to form a raid party to take on the first floor boss. He organized the participating players well into groups according to their specialty and displayed great leadership to motivate and lead the raid party. He is also a beta tester of Sword Art Online but pretended to be a newbie player to escape the wrath of the players against them. He used Kibaou to strike a hidden deal with Kirito via Argo's services. Kirito thought that it was a ploy to have him be cautious and lose focus so that he will be placed at the back of the raid party and not get the Last Attack on Ilfang, the Kobold Lord. But in truth he did that to make Kirito notice that he is also a beta tester as Diabel heard of Kirito's skills in floor clearing in the beta testing. He died in the boss' hands as he did not notice the changes in the boss' attack patterns. His last words to Kirito was to defeat the boss.
One of the participating players in the first raid party to defeat the first floor boss. He openly spoke out in the first meeting and called out the beta testers hiding in the meeting. He wanted to have them apologize to all the players of SAO for not sharing their knowledge in the game and monopolizing the efficient hunting grounds. He was also the one who was striking a deal with Kirito to buy his sword but Kirito later found out that Kibaou was just being used by Diabel to draw him out as a beta tester. After the boss battle, he had Asuna tell Kirito that he does not acknowledge him and will still best him in the next boss battle. He was mentioned in volume 2 that he was one of the leaders of along with Sinker. He stages a coup on the leader of the Army Sinker, and seizes control. He also ordered the army squad led by Cobert to take on the 74th floor's boss. His name is in katakana but if read in kanji, it means "Fang King".