In defense of Rosa

[Kawaii Ryûkishi]

I just wish there was more of a need for her archery skills. BTW, was it ever mentioned how and why she learned to be an archer? If so, I missed it.

In Japan, the bow has historically been regarded as a woman's weapon. And in Japanese fiction, it's been wielded by female characters more than any other weapon. So, for Rosa to specialize in archery isn't something that needs a particular explanation so much as it's simply a matter of fact.