Yup Whisp is in! But is it ok if I make her the Super Duper High School Worrywart and make her look out for people and care for them? Of course, her personality will not change nor her appearance, but while looking for the person she wants to be her Senpai she could look out for some people if that's OK. It's just cause the others are Genius/Gamer/Rich Kid/Literature Kid/Athlete etc.
That sounds fine! This is your story, so you can do whatever you want with Whisp. She's a work in progress OC anyways, so It's fine to change things.