The Theory Edit
Many people think that some characters in Keeper of the Lost Cities are LGBTQ+.
A majority of people headcanon Biana as bisexual, but a few people headcanon her as gay, dubbing her "Lesbiana".
Some people think Mysterious Miss Foster is asexual or greysexual.
Keefe is widely headcanoned to be pansexual (or in some cases, gay.)
Tam is headcanoned as gay by many people. This is contradicted, however, since some people say he has a crush on Biana, though that has not been confirmed.
Linh is headcanoned as asexual.
Fitz is widely headcanoned as queer, ranging from pan/poly/bisexual to transgender.
Wylie is headcanoned as a gay trans boy in many cases.