nephelia

Official English name: Nephelia

Nicknamed "Nephy", she is the primary heroine of Maou no Ore Ga Dorei Elf wo Yome ni Shitanda ga Dou Medereba Ii?

She is visually identifiable for being an elf, her very long white hair with a large red ribbon in it, blue eyes, fair-sized breasts, and usually wearing an elaborate slave collar.

Her usual attire (besides the collar and ribbon) are a white full-length dress or a blue maid outfit.