how long the lgbtq acronym can get:
LGGBBDTTQQUIAAAAPPP2SNBGVGQGNC+
Lesbian, Gay, Genderqueer, Bisexual, Bigender, Demisexual, Transgender, Transsexual, Queer, Questioning, Unsure, Intersex, Ally, Asexual/Aromantic, Agender, Pansexual, Pan-romantic, Polyamorous, two-spirit, Non-binary (or technically could be ‘Number-based’), Gender Variant (or Gender Diverse), Gender Queer, Gender Non-conforming, etc.
you could also add xengenders