Negi Springfield is the central protagonist of the anime Negima!? and a young mage from Wales. He is the son of the legendary mage Nagi Springfield, known as the Thousand Master, and Arika Anarchia Entheofushia, the last Queen of Vespertatia. After a demon attack on his village during his early childhood, Negi was saved by his father, who gave him a staff and disappeared. Negi was subsequently raised by his cousin Nekane and the people of his village. Driven by a desire to find his missing father, he entered a magic academy and graduated at the age of ten, after which he was sent to Japan as part of his training to become a Magister Magi. There he became the homeroom and English teacher of Class 3-A at Mahora Academy, an all-girls middle school.

Negi is kind-hearted and optimistic, displaying maturity beyond his years in his role as a teacher and in his interactions with his students. However, he also retains childlike traits such as an aversion to baths, a tendency to panic in stressful situations, and a stubborn, sometimes reckless drive to help others even at his own expense. His principal motivation is to track down his father and understand the circumstances of his disappearance, a goal that pushes him to train relentlessly and take on dangerous challenges.

In the story, Negi serves as both the mentor and the student, learning alongside his pupils while guiding them through magical and personal problems. His role expands from a mere instructor to a leader who forms pactios—magical contracts—with many of his students, granting them artifacts and abilities. His closest ally among the students is Asuna Kagurazaka, who initially distrusts him but becomes his guardian and partner. Other key relationships include his strict and powerful teacher Evangeline A.K. McDowell, who trains him in advanced and dark magic; the martial artist Ku Fei, who teaches him Chinese kenpo; and the veteran warrior Jack Rakan, who further hones his combat skills.

Negi undergoes significant development from a bookish novice into a formidable combat mage. He begins with a strong command of basic elemental spells, particularly wind and light magic, but later masters lightning magic and develops a unique fighting style combining delayed spells and hand-to-hand combat. Under Evangeline’s tutelage, he learns Magia Erebea, a dangerous technique that allows him to absorb magical elements into his own body, granting enhanced speed, resilience, and new abilities such as lightning-speed movement and a permanent lightning form. He also demonstrates exceptional learning speed and analytical intellect, mastering techniques in hours that would normally take weeks. Through his pactios, he gains access to a variety of artifacts, including the personal card-holder known as the Thousand Bonds, which enables him to temporarily use the artifacts of his contracted partners. Throughout the series, Negi’s growth is marked by his increasing willingness to embrace difficult and even forbidden methods to protect those he cares about, ultimately transforming him into a figure capable of challenging the most powerful enemies in the magical world.