>>52671480For shonen and seinan alone It worked fine for Soul Eater, Medaka Box, Claymore, Promised Neverland (Manga), and Psycho Pass. If Riko is a tomboy it won't be an issue.
Besides they already made the female companions eye candy to keep boys straight, making the tomboy protagonist the first crush of many boys sounds like a good idea to me. Nobody self-inserts now days it's considered autistic 