Curate, connect, and discover
Ok unpopular opinion BUT
I'd rather see Loop look like the wonderful star they are and find a new party/family to call their own post-game.
Loop still looking like a star is, admittedly, mostly because I can't imagine Loop as anything else. Loops the star! My lil star! But also I think Loop deserves to love who they are. Who they are is a star. And I think if they became a human, no matter what they did, they would look into the mirror and staring back at them would not be Loop, but Siffrin. I want them to look at themselves and at least go 'this looks like me. No one else but me.' Maybe in the future they change, but not until they can control the change themselves. Not until Loop learns who they are. Loop has been forcibly changed so much, taken apart and reformed to match someone else's desires or needs or wants, and I think they deserve to shape themselves. To be able to one day look in the mirror and see them. Whoever that may be.
I also want Loop to choose their life. That's kinda why I think Loop should be able to find and make a new family. I feel like if Loop were to acclimate themselves with the original party, they would always, to an extent, feel like they're forcing themselves into a place they don't belong in. Always just there. Always that extra thing Siffrin brought in. Always the poser. The 'fake' Siffrin. Even if they don't know, even if they still love Loop for Loop, that's how it would always feel to them. Because Loop will always feel like they're surrounded by strange and slightly different copies of their family.
I think if they were able to wander on their own, find their own family, I think that the comparison would be able to stop one day, or at least not hurt as much anymore. Loop won't be constantly surrounded by a reminder of what they lost and what could've been, they'll be constantly surrounded by the fact that despite everything, they are still loved. They are still loved as Loop, as their own person with their own emotions and heart and reactions. They won't feel the scrutinizing stares of people who keep trying to figure out why Loop seems so familiar and different at the same time. They can just be Loop. They can relearn love and open up on their own terms and become something more than the Universes designated failure and helper for Siffrin.
And maybe one day, after Loop changes, now feels like their own person, and is surrounded by their own family, one who knows of their story and past, one who loves so warmly and gently it let's the the wounds of being someone else fade, they'll run into Siffrin again. Yet this time, there is no lingering animosity, there is no pain in feeling like an accessory to them, a side character in what was supposed to be their story. Now, it's the nostalgia of seeing someone who survived hell with you. They can sit and talk together about their own families and travels and they get to just be two people in the Universe chatting happily. Loop sees the others come towards Siffrin and the sting of pain they used to feel seeing them is no longer there. Because Loop can still find their happy ending. Loop can still be loved. And Loop knows that now.
I just want Loop to be loved and feel it and to be able to accept that love fully instead of having the hanging shadows of their past as Siffrin taunt them.