>>532865tl;dr Nyaru is a failed idol, big idol fan, very proactive and full of energy, caring for other people.
Nyaru lore of a failed wannabe-idol is just her, a not a kayfabe, and shapes many parts of her personality.
She's a big big idolfan, apparently was a shutin all her life, skipped school to watch idol concerts and shit, then dedicated herself to try to reach that dream for 10 years (assuming 15 to 25?), but kind of failed, which is understandable if you hear her sing. She however went into managment of hanlded many Texas idol cons.
It's very noticeable how much it affected her. If you know a bit about Kiara story, this is similar but with more failures and no happy ending.
She has confidence issue but is very genki in her overall atttitude, she seems to have abyssal self confidence. She really like supporting other and get a lot from their success.
Nyaru seems very open minded overall, pretty direct, and will not shy away from answering all kind of questions and definitely appreciates literally anything you would throw her way.
