Naomi

Naomi is a nurse who works in Inkey University. 
Besides of her profession (and the fact of actually having one that requires many years of studies), she is very young and also is in pretty good shape by herself.
Because of her experience, she is like a "senpai" for any other male and female students, and is always giving friendly advices to everyone. 
However despite all this, she seems like an ice-cold person, in the perspective of anyone who actually "knows" her (She doesn't really cares that much about feelings at all).
In other words, Naomi is an intelligent and apparently gentle woman.