And since the list is so short I’ll also recommend one comic book series I enjoyed reading called We(l)come Back. There’s 8 issues which have been collected in 2 volumes (1, 2). While the characters are both implied to identify as female in this timeline they’re basically reincarnations who fall in love with each life but “live” as different people (and different genders, some of which are shown in the comic as well) so you can argue that they’re both genderfluid and pansexual. But hey wlw soulmates!
If someone knows any other books that are out there, please let us know!