Nenji is Nanaka's classmate and childhood friend. He is a delinquent, but after Nanaka's accident, he calms down. Nanaka's father entreats him to keep Nanaka's accident secret from other people. Nenji is occasionally referred to as 'Wild Hair Nenji' by some of the other characters. He has long, spiky hair reminiscent of certain stylized Sh�nen anime characters. (Source: Wikipedia)
Kuriko is a kindergartener. When Nenji rescued her from bullies, she falls in love with Nenji. She considers Nanaka to be a rival of love. (Source: Wikipedia)
Nanaka's doting father. He will buy her any Magical Domiko accessory she desires. He enjoys the fact that he can re-experience Nanaka's childhood, because she gave up on it way too early in life.
A human who attends the magical academy in the city-state of Ariadne and is training to be a mage knight, and Emily Sevensheep's partner. Beatrix is most likely one of the 67 million residents of the Magical World who is pure human (and hence can be saved by Kurt Godel's plan), as seen when her magic is able to do damage to the demons that attacked Negi's crew during the party held by Godel. (Source: Negima! Wikia)
Emily Sevensheep is a beast-girl who attends the magical academy in the city-state of Ariadne and is training to be a mage knight. She is among the most accomplished of the cadets and is also the class president of Class 3-C. Her personality is similar to that of Ayaka Yukihiro, and she looks down on those whom she considers as dunces or peasants. Like many others, she is an absolute fan of Nagi Springfield (her fanclub member number is 78), and she believes that the 'older form' of Negi is actually Nagi reincarnated. Her mother is shown to be a huge fan of Nagi as well. Emily has developed a rivalry with Ayase Yue, who became a fellow cadet after losing her memory. Initially looking down on her as a 'dunce', Emily has since recognised Yue as a competent magic user on-par or better than herself, after seeing Yue's ability in coordinating both of them, Beatrix and Collet while taking down a griffin-dragon. During the attack on the Royal Palace at New Ostia, Emily was erased by the "Code of the Lifemaker" while defending her comrades, disappearing into nothingness before Yue's eyes. It appears she is dead, however according to Nodoka Miyazaki she has only been sent to Cosmo Entelechaia and may be brought back into existence by the Great Grandmaster Key, of which little is yet known.
A high-level demon, he had three hearts before giving one to Nanoha. All three must be destroyed in order for him to die. Despite his power, he often has a very childish personality and is gluttonous. Often taking the form of a little boy, some of his actions in this form disturb Nanoha such as when he reads porn, smokes, and drinks beer. Despite his constant vow to retrieve his heart from Nahoha, his determination becomes weaker and he comes to deeply care for her. He even gives her another of his hearts when the first is taken by an enemy.
Mahoro is the Vesper android that has only a year left to live. She decides to become a maid, and work for Suguru Misato. She loves to cook, clean, and even take baths with Suguru. She also has a strong sense of morality and when she finds an ecchi magazine in Suguru's room, she'll confiscate it.