ムスタ

The ruler of Dungeon 4. She was taken in by the previous Dragon King and raised like a sister alongside Rumi and Kissa. Though a dark elf, her easygoing and laid-back nature makes her seem unlike a creature of darkness. She acts as a guide when Kissa ventures into town. She has a tendency to unconsciously engage in combat when her dark heart becomes uncontrollable. [From Official website]