There are plenty of things to know about Chizuru. One is that she boasts the largest bust size in class 3-A. Add to the fact that she does volunteer work at the Mahora Day Care center and you've got yourself a very "motherly" person. At an early glance, Chizuru comes off to someone as a kind but quite naive big girl, and that is not entirely wrong although her behavior sometimes suggest otherwise.
Chizuru doesn't play much of a part in Negima until much later in the series. She gets her chance to shine when she takes in a stray puppy who turns out to be a dog-boy named Kotarou Inugami. When she sees him she decides she wants to keep him and care for him. She has two roommates: Natsumi Murakami and Ayaka Yukihiro. The only reason Ayaka lets Kotarou stay is because Chizuru told her that he's Natsumi's little brother.
Chizuru can be a very strange girl. She can be somewhat perverted at times and in other times a little weird. One thing to say is that she's surprisingly fearless. Like a mother bear defending her cubs, she will not back down from an opponent no matter how strong he or she is. Her mothering skills are not to be trifled with either; her giant breasts have the power to bring people to their knees, especially if you get caught between them. Those who know Chizuru can say with confidence that she can be very scary sometimes, although how scary she can actually be we have yet to find out.