Since I couldn't find any other SMT/Persona idea thread, I felt the need to revive this so I can put this idea somewhere:
During the events of P4A, Narukami develops a strange friendship with Mitsuru Kirijo. Not necessarily a Social Link, but there's just something about Narukami, Mitsuru thinks to herself, that attracts her to him, while Narukami felt a kinship with Mitsuru, her demeanor reminding him fondly of Margaret. This strange connection develops into a deeper bond, and Narukami is surprised that a new Empress Social Link has started, despite the fact that, deep in his soul, he could still feel his connection with Margaret.
It can be a romance, but it can be fine as a genfic. Hell, it'd be fine if it was a comedic Three-way with Narukami, Mitsuru, and Margaret.