Nia is super serious when it comes to studying, is exceptionally athletic and as Rokka stated has an extremely good fashion sense and style. She easily passed Aizawa who is considered the fastest runner in the school. When Aizawa confronted her saying her running speed isn't normal she became scared and backed off. Rokka is also fascinated by her panties and started stalking her. In ch 30 a cat was found injured. Junk-san entwined her tail and Nia woke up naked. It turns out Nia is a Nekomatta.