Originally a Japanese man who lived as a shut-in otaku and NEET for decades. He was kicked out of his home by his brothers, who had reached their breaking point after he failed to attend their parents' funeral. While wandering, he was hit by a truck and died while protecting students. He was reincarnated into the "Six-Faced World," the setting of Mushoku Tensei, and given life as Rudeus Greyrat. His name from his previous life remains unknown throughout the story. Since it is not a name associated with good memories, he dislikes answering when asked and consistently identifies as "Rudeus" after his reincarnation. His nickname is "Rudy." His appearance changed completely upon reincarnation. As a side note, the surname "Greyrat" is mentioned in the story as meaning "Gray Rat." As if his name reflects his identity, he prefers wearing mouse-colored robes. For his persona in his previous life, refer to "The Man from the Previous Life." Persona after reincarnation: Based on his past experiences and reflections, he makes a conscious effort to "not get carried away," "not blame others," and "work hard." He never neglects his effort or training, is always polite to everyone, and is a powerful mage who can also use swordsmanship. Even if something inconvenient happens, he remembers the other person's perspective or his own past self and rarely gets angry. However, if he feels his precious things are being insulted, he shows a rage that turns those around him pale. He is also a bit of a pervert with a lecherous side. He uses polite speech (desu/masu) with almost everyone. He is in love with Sylphie, whom he taught magic to when they were children!