Genjitsu Shugi Yuusha no Oukoku Saikenki

[DarthEnderX]

So, Roroa is a gold digger. Although I suppose she might be the hidden agent unifying Amidonian rebels against the waste-of-skin prince (although the finances minister was thanked for that).

I'm pretty sure she was. They were both shown meeting with her a few episodes ago.

What exactly can she offer?

Legitimacy maybe? Even if the people asked for it, he still gained the country through rebellion. Marrying a member of the royal family clears up any succession complications.