Is Marsa a woman? I assume that they're a guy, but it's hard to tell with the language barrier.
It is assumption. To be honest I am not sure, as I didn't remember to see it writen down anywhere. However Marsa sounds to me like woman name (although I cannot be sure since it is different language). Every work is exclusively from woman pow and almost every major character is also woman. And if there is men present they are somewhat inclusion is somewhat minimal. From which I assumed she(?) is more confident to write from woman perspective.