cool franchise all about action and adventure and beating bad guys and being cool and awesome. romance is not, and never will be, important ever.

leading female character exists as a core character in the main group, her primary role and focus is SPECIFICALLY romance and love between her and the main protagonist.

the main protagonist does not care about, or focus on, love and romance, because the focal point of the series is the cool action and adventure and the battles against evil.

the girl character embodies love and romance, and makes it the most important thing in the whole series that was designed to NOT have romance as a priority at all in any way ever.

it is a paradox. like my hero academia not being about romance at all because the focus is saving lives and beating bad guys, but ochaco uraraka's entire story arc and character and final battle revolves around how much she loves deku, and her main rival is a girl who also loves deku and ochaco and has a whole complex with her own expression of love being weird to everyone else. and so the final ending for mha has to resolve ochaco's "love-focused" character role by having her finally get with deku, but only after all the "i wanna be a hero" stuff (the ACTUAL main plotline and theme) is resolved entirely first.

one of sonic the hedgehog's core defining character traits is that he is so free-spirited, that he'd never settle down for a relationship. so having a girlfriend/love-interest character does not fit him at all, and never will. in spite of this, amy rose exists, and she has to exist, because she as the girlfriend/love-interest character DOES fit sonic's character and always will. sonic is mickey mouse, he needs his minnie mouse, amy rose has to exist. and her entire character is centered entirely on love and romance and stuff, things sonic doesn't care to have anything to do with. mirroring the clash between these concepts within franchises like this, all over the place.