Are we talking gender gender or sex gender? My answer varies depending on which one you mean.
I was raised in a very conservative environment, such that I had no concept of transness or of gender as something distinct from what's between my legs. "Male" was literally the only conceivable option for me. So when I developed a sudden obsession with foxes in my teens and started imagining myself as one, that fursona was of course male. Over time he developed into a sort of idealized masculine self: Cool, confident, cunning, stoic. (With OP magic anime powers because I was a teenager, after all.)
But at the same time I started to realize there was this other side of me that I usually kept hidden. A real me. One my fursona could not express. So I made a secondary sona. A small, cute little arctic fox who was shy and timid but very much wanted to help people. Strongly empathic, emotionally deep, the sort of person to stop and smell the flowers because it would be sad if nobody appreciated them. Somehow they had ended up with a strongly feminine personality. But they're me, so they have to be male, right?
25 years later I finally realized what that little floof was trying to tell me. We may be amab, but we're not male. Not on the inside where it matters.