|Measurements||Height: 158cm, H cup|
|Hair||Ahoge, Curtained, Green, Parted in Middle, Sidehair, Waist Length+, Wavy|
|Body||Demon Tail, Horns, Huge Breasts, Mole, Nail Polish, Pale, Pointed Ears, Slim, Tattoo, Young-adult|
|Clothes||Brooch, Detached Sleeves, Earrings, Fishnet Stockings, Half-Skirt, Nipple Covers, Pointed Hat, Stockings, Thigh-high Boots|
|Role||Based on a Fictional Character, Bisexual, Magician, Not a Virgin, Servant|
|Visual novels||Side character - Girls Book Maker -Shiawase no Libretto-|
|Voiced by||Misonoo Mei|
The other main character of "Faust". Unlike the original story which highlights the price of the demonic pact, Mephisto's raison d'etre in the story world is to serve others without asking for anything in return. Although she primarily serves Faust, she will take requests from Goethe and others if she thinks it appropriate.