But I'm A Cat Person by Erin Ptah - Urban fantasy webcomic featuring a bigender character - Timothy/Camellia Mattei - as well as numerous 'Beings' who are able to take on both male and female forms. Also features various LGBT characters. Updates three times a week.
Mia Siegert's novel Somebody Told Me has a bigender protagonist who goes by Alexis and/or Aleks.[1]
The protagonist of Baker Thief, by Claudie Arseneault, is bigender and aromantic.[2][3]
Why We Fight, by T.J. Klune, has a bigender protagonist.[4]
Currently-in-development dating sim The Office Type includes the character Mx. Hura Stapleton, who is bigender.[5]
Currently-in-development dating sim Repurpose includes the character Cheri, who is bigender and omnisexual.[6][7]
Currently-in-development visual novel ValiDate: Struggling Singles in your Area includes the character Emhari Abdi, who is a bigender lesbian. Emhari uses both "he/him" and "she/her" pronouns.[8][9]