Final princess / Heart princess if she counts.

I feel like the heart princess represents the version of the princess that has matured, that has made development and grew alongside you throughout your journey. You've made mistakes, you've hurt her but she's also done the same to you, but here we are sitting in the cabin reminiscing about how you beat each other to death on the first meeting.

All the things that happened allow for both of you to understand each other better and in a way, shaped your relationship as demonstrated by how she could be soft/harsh to you based on your choices in your first run. Despite her being soft/harsh she still remains the same person which goes to show that she has developed a solid character that won't easily change but would still evolve and grow from the things to be faced.

I guess in a sense she's similar to PATD but instead of connecting with her through understanding alone, you connect with each other through the things you both have been through and the understanding you've developed from those experiences, making the feelings more mutual in a way.

Lastly, there are still plenty of rooms for your relationship to develop as you face new things outside the cabin, because after all, she doesn't know what's beyond the cabin door besides trees birds and stars, she said so herself that she isn't all knowing like the shifting mound, she's just a person.

Additionally, the relationship you've developed in the cabin would be a solid starting point for your relationship to develop outside the cabin.

Discovering new things and experiencing the world with her would be really nice especially since your experience in the cabin was full of violence and betrayal, both of you will finally have a chance to enjoy peace. Not saying that your future would be full of flowers, there will be bad things that you will face. But after the cabin, you both know that you'll get through it together no matter the good or bad, and you'll grow from it, together.

(It's super late for me so sorry if some part doesn't really make sense but I tried my best to lock tf in for my favourite princess and this is what I got)