Eugeo

Eugeo is a fictional character from the Japanese light novel series Sword Art Online, its manga adaptation, and anime adaptation. He is a prominent character in the Alicization arc of the series. Eugeo originates from the virtual world of Underworld and is initially depicted as a kind and earnest young man, albeit one with a deep sense of melancholy due to a past trauma.

He is a resident of a small village within the Rulid Village and works as a lumberjack. His life is marked by the "Fluctlight," a system that governs the citizens of Underworld, which has erased his memories of his childhood friend, Alice Zuberg. This memory loss is a central theme for Eugeo, as he embarks on a quest to recover his memories and save Alice.

Eugeo becomes a close companion to Kirito, the protagonist, after they meet in the Underworld. Together, they navigate the complex social structures and dangers of this virtual realm. Eugeo wields a unique sword called the Blue Rose Sword, which possesses immense power. His journey is characterized by his unwavering loyalty, his struggle with his own identity, and his determination to protect those he cares about. His development throughout the Alicization arc is significant, as he confronts his past and grows into a formidable warrior.