Seabunnygender is a xenogender connected to sea bunnies, especially in the context of gender fluidity (as sea bunnies change genders over the course of their lives).
History
Seabunnygender was created by a Twitter user who no longer has an account, though they made a Carrd with information about the gender.[1]
Flag
The flag has seven stripes, going from black on the edges to white in the center, reminiscent of sea bunnies' appearance.
Resources
Content warning: m-spec and male lesbian exclusionism