Spoiler Alert: This article/section contains details about future plotlines described in the light novels, not covered in the anime. Do not proceed unless you want to be spoiled.
Agil (エギル,Egiru?) was one of the 10,000 players who were trapped in «Sword Art Online» (SAO). He was a veteran axe-wielder and a merchant who owned a shop in Algade, a city on the 50th Floor of «Aincrad» in SAO. His real name is Andrew Gilbert Mills (アンドリュー・ギルバート・ミルズ,Andoryū Girubāto Miruzu?) and he runs a shop, called «Dicey Café», in real life.
Agil is a friendly and very helpful person who is always looking out for others. He is also someone to rely on such as when he defended the beta testers against Kibaou, giving Kirito a place to stay, and helping players on lower floors. He also can be a leader on the battlefield and will help his comrades and friends no matter what the cost may be. Although he acted as if he only cared about the money, Kirito commented that Agil had spent all of his money helping mid-level players level up.
Andrew is of African heritage. He is a massive and bulky bald man with a brown goatee and brown eyes. He also has two silver earrings on his left ear. Kazuto also commented that he is as large in real life as he is in-game.
Although African-American by ethnicity, Andrew's parents took a liking to Japan. Andrew was born in Ueno, Tokyo, and he opened his coffee shop-bar in Okachimachi at the age of 25. Among his customers was a woman, named Kathy, who was a foreigner, lived nearby and shared interests with Andrew, thus Andrew and Kathy eventually got married. Afterwards, Andrew got trapped in SAO for two years and when he came back, he expected the shop to have closed long ago, but it was saved by his wife's efforts.
Agil was first seen defending the beta testers from Kibaou, who was saying that they caused the 2000 people to die. He showed Kibaou «Argo's Strategy Guide: First Floor Boss edition» and said that the beta testers were not all to blame as they gave everyone free information, which they could obtain for free in any NPC shop. In the boss fight, he and his party helped Kirito and Asuna beat the boss.
He also showed capable leadership during the first boss fight, being able to safely lead his party without any casualties. Agil also spoke out against Kibaou's accusations against the beta testers, noting that Argo's freely distributed guide had information from none other than the "selfish" beta testers themselves.
Nearing the end of the second year, he appeared as the merchant who Kirito tried to sell the Ragout Rabbit's Meat that he had acquired to, until Asuna showed up and Kirito realized she would be able to cook it.
Agil made his primary store location on the 50th Floor's city, «Algade», and has a good relationship with Kirito. His store motto was "We buy cheap and sell cheap", and although the latter part was usually doubted, he in fact used his income to help players on the lower floor. After Kirito was revealed to be the second Unique Skill user, Kirito temporarily lived on the second floor of Agil's shop to avoid public attention.
Agil later closed his shop and came to the 75th Floor's boss battle to aid in the boss fight. Prior to Kirito's rematch with Heathcliff, Kirito thanked Agil for always helping and supporting the mid-level players of the game in order to reach the front lines.
After completing SAO, Andrew returned to manage his shop, Dicey Cafe. His wife was able to keep the shop from closing during his two years of absence.
As Asuna had not returned after the completion of SAO, Andrew showed a screenshot taken in ALfheim Online of what appeared to be Asuna, tipping Kazuto off to her location. Andrew gave Kazuto a copy of the game, and Kazuto was pressed to return to the world of VRMMORPGs and save Asuna.
Although he did not play ALO during the few days during which Kirito saved Asuna, he played ALO later as a Gnome Axe-wielder. He even played with Kirigaya Suguha, Kazuto's sister. Andrew's cafe was also used for the celebration of completing SAO and the rescue of Asuna. Many remaining SAO players came to the celebration, including the Aincrad Liberation Force's (The Army) leader, Thinker, as well as his wife, Yulier.