As one who has never quite been satisfied with Kara coming back as a ghost, I’d like to explore the other two options that are already more or less set up in the BSG universe…
Kara comes back as head!Kara
One my favorite fics
The Breathe Between by
shah_of_blah explores this idea. Kara comes back and only Lee can see her.
Kara comes back as a cylon
I actually can’t think of any recs for this one. But I love this idea. The way it would completely change how Kara and Lee related to Cylons, each other and everything.
Or if you’d like, make an argument for the ghost/avatar Kara we got in canon.