I agree with Flora about Thinial; there must be a lot of lesbian couples there (including, possibly, Flyairth and Prake).
Also Hyzenthlay and Thethuthinnang

Also, the four rabbits at Nuthanger Farm might also be LGBT+. They don't have any kittens, and since Clover has some after the escape (I don't remember about Boxwood and Haystack?), there are no fertility issues. Flora mentioned in another thread a Clover/Haystack relationship, and that is really awesome

(Boxwood/Laurel would be rather sad, though, since Laurel ends up staying in the hutch...)