I would trade Calypso for Eva in a heartbeat. (no need to fight, all the Calypso lovers can still choose her no matter what I do)
On the topic of princesses...
Not all princesses are bad, not all are good. Their being a princess is irrelevant in either case. Princess is a title, not a personality.
The continued discussion has reminded me of something important about Calypso's bathroom scene where, if you choose it (I did to see what happens, then reloaded to get back to my preferred path) she makes Orion cum. It isn't even slightly erotic to me. Now to be fair, neither was Maat's scene (post-Nova section, which was massively erotic). Both are shallow lust. Contrast with the scenes for all the others, including Eva, where the sex is more than just sex. And don't get me wrong here, there's nothing wrong with sex that is just sex, it can be exciting and fulfilling and it has its place in the world and people should enjoy it if they want to. I'm only explaining why to me the others are all more exciting when you're in a story which has a heavy focus on relationships. So while I really enjoyed Maat's scene, I took it for what it was. And if I'd thought that I could play Calypso's scene the same way, and not have it be the first steps of a relationship with her (which it is implied is eventually where that would be going) I'd maybe not have skipped it.