Amba/Sikhandi (Indian myth)
Gender-Swapping Princess Out For Revenge
When this princess had her life ruined by an unstoppable warrior, she: became a fervent ascetic for years and got a divine boon; killed herself to reincarnate faster; came back as a man; and killed the man who'd wronged her, in the stunning climax of the world's longest epic poem.
Xtabay (Mesoamerican myth)
Siren of the Yucatan
Chaste and virtuous woman spends life assuming she’s better than her more sex-positive neighbor, and for this haughtiness becomes in death a demonic woman who lures wayward men to their death – a stunning indigenous inversion of the Madonna/whore complex.