Because that's not how the character's name is spelled, there's no "u" on the end.

To be fair, that's a valid way to Romanize the character's name to indicate the long vowel. It's just not the official one.

Go watch Inuyasha or some other Shojo manga/anime if you want a female cast!

Inuyasha technically is Shounen. It was published in Weekly Shounen Sunday alongside Detective Conan.

I'd argue that there are Shounen manga and anime like Inuyasha that are aimed at women as a secondary demographic that they would enjoy (e.g. Toilet-bound Hanako-kun) that they should be checking out instead of making these demands.

But a lot of girls and women are obsessed with MHA, particularly shipping the male characters together for their yaoi fanfics and art, and lack the self-awareness required to realize they aren't the primary audience and accept the story for what it is.