The Rose Bride is a little bit like the mortal, she is bound to someone and it is usually an abusive relationship? In like, she did not choose, but was conquered and subjulgated. Mostly the vibe I get from Anthy is that they try to romanticize her situation, but it is an abused role.

Which I think rings really really well with an princess archetype. An we know how bad the "helpless princess" image influences little girls...

Maybe you could inspire in other princess, like sleeping beauty and snow white. And I like the idea that she gives powers to the one who owns her, but is kinda powerless herself.

Do keep working on that, dude, I got really interested on the Idea! I think I would love to play that xD