In the book fangirl, who is the most memorable character, and what makes him/her so memorable?

I think Cath is the most memorable one because she is relatable for me. I have same problems as her. She has a social anxiety disorder, and only things that makes her happy are writing her Simon Snow fan fictions for her followers and writing her fiction in writing class. So cath is a freshman in university with her outgoing sister. Her sister will stop being a fangirl so Cath will have harder time for making friends. Book shows reality of fangirls. Cath have a hard time letting go her fandoms, and being more social. So most memorable thing in the book was develop of Cath for me.