Eugeo

Eugeo (ユージオ) is a protagonist in «Alicization Beginning».

Background
Eugeo is a wood cutter of Rulid Village and Kirito's best friend in the beginning. Kirito was then unheard of when their friend Alice was taken away. However, upon Kirito's return to Underworld, in which he has no memory, Eugeo is the first person Kirito (as Kazuto), encountered upon awakening. He is given the Sacred Task of cutting down «Gigas Cedar».

Alicization Beginning
Eugeo has been Kirito's friend since childhood, and has just recieved the Sacred Task of cutting the Gigas Cedar tree with Kirito. While having meal with Alice and Kirito they decide to travel to a cave in the Mountain Range at the Edge. They find ice in the cave, along with the bones of a dragon and the Sword of Blue Rose. On their way out they confuse the way out and see the battle between a Black Knight and an Integrity Knight. The next day along with Kirito he tries to save Alice from the Integrity Knight but they're inutilized by the villagers.

He is the first person Kirito encounters when he returns to Underworld and helps him find where to stay on the village. The next day, he shows Kirito the Sword of Blue Rose he brought from the cave in the Mountain Range, but they're unable to use it. He helps Kirito look for Selka when she escapes and fights the Goblins in the cave, but is gravely injured. Kirito and Selka save his life and after two days he returns to his task of cutting the Gigas Ceda. With Kirito's assistance he manages to master the use of the Horizontal Sword Skill and cut the Gigas Cedar in five days using the Blue Rose Sword. On the festival organized to celebrate his feat he reveals that he wants to be a swordsman and is challenged by Jink to a duel to decide who will leave the village. With Kirito's advice he easily defeats Jink, and with Kirito they depart to Zakkaria.

Alicization Running
Since leaving the village, Eugeo and Kirito have been working as stable-boys in the «Wilde Farm» on the outskirts of Zakkaria for about 5 months, training and waiting for the tournament. On the 28th of August, the day of the tournament, Kirito and him are about to enter the West gate of the town a when a horse goes wild and charges them but fortunately they are able to calm it down and discover the cause of its distress to be a «Large Marsh Horsefly». Kirito gives his suspicions on why one is so far from the nearest swamp and warns him to be warry of future incidents.

As the pair stop to get some food, Eugeo gets a bit nervous from seeing more people than he is used to in Rulid Village but Kirito tries to get him to loosen up. After signing up for the tournament, both of them enter the tournament restroom and after a scouting quickly they are relieved that none of the participants are female. While they prepare Kirito comes up to him and warns him of one of the participants whose personality is similar to Jink's.

Both he and Kirito are able to be in different blocks during the tournament and somehow are able to pass the preliminaries, win the tournament in their respective blocks, and both become guards. By next spring, each of them recieve letters of recomendations to attend the Royal Swordsmanship Academy. After they enter he becomes the valet of the 3rd best swordman in the academy, Golgosso Valto.

After the practice he talks with Kirito during dinner and later helps him with the plants he's growing, where he asks about what will Kirito do after recovering his memory. After Kirito asks for his sword he reminds him that the next day, March 6th, something important was going to happen.