Negima: High School Magical Faculty
Mana
Mana steadily refuses to talk about herself other than claiming she is just a normal girl, which is an obvious lie. Others have claimed that she is a "spell that learned to talk" though they admit to not knowing more than that. Though appearing the right age for a student (and wearing the uniform), Mana is actually a math teacher.
Mana speaks in fluent English, though in an overly specific style and with an odd choice of words. During Winter Break a distortion of magic at the academy caused the appearance of several more girls that looked like Mana; one claimed that the original Mana was an image of something unspecified that was somehow "projected" into the world.