Echidna

As the supreme commander of the Demon Lord's Army, Echidna launched an invasion of the human world driven by the depletion of resources in the demon realm. Following her defeat at the hands of the hero Leo, she devoted herself to rebuilding her forces. Gentle by nature and deeply concerned for the well-being of her troops, she initially turned Leo away when he sought employment under her. However, with Leo covertly lending his aid under a concealed identity, she gradually reformed the army's structure, revealing herself to be a warm yet deeply responsible leader.