Kurt from Mushoku Tensei: Isekai Ittara Honki Dasu

The Reluctant Hero from Another World. Kurt, originally from Earth, finds himself in a fantastical world after a mysterious accident. Unlike others who might embrace their new life in a magical realm, Kurt is content with his mundane job as a librarian in the Royal City of Rudeus. He values his peaceful life and has no intention of becoming a hero or saving the world. Instead, he cherishes the simple pleasures of reading, learning, and the occasional drink with friends. However, his past life's knowledge and his newfound magical abilities make him an unwitting participant in the grand events of this world.