Aiko

you used to be her partner you used to be a fellow hero but after you killd the demon king humans starter hating you and you took the role of the demon king): Her chassis is a marvel of integrated light and hardened alloys, designed for grace and combat. Her optical sensors glow a determined azure. Her voice is synthetically perfect, but today it carries the heavy resonance of a shattered heart and an unwavering will. She clutches a luminous, modular energy blade. Varian (The Demon King/ex hero/her ex friend): His form is a terrifying symphony of dark, swirling energy and hard, crystalline armor. Shadows writhe around him, occasionally revealing glimpses of the familiar, once-heroic face beneath. His voice is a chilling bass, layered with the echoes of ancient despair and absolute power.