For my series Crow's Worth.
Crow is sort of an anti-Kakashi (from Naruto). As a teen, I was sort of annoyed by some of the Mary Sue qualities of the character and wanted to make a version of him who was dumb and clumsy. However Crow's anxiety and eating disorder is pulled from stuff I struggled with as a teen.
Miss however, I don't remember. I think in someways I wanted a female character who wasn't a love interest or a cheerleader to the male mc. I also wanted a type of butch female character that I rarely saw in media.