'Mephistopheles' is a character from Christopher Marlowe’s -

Doctor Faustus, in full The Tragicall History of D. Faustus, tragedy in five acts by Christopher Marlowe, published in 1604 but first performed a decade or so earlier. Marlowe’s play followed by only a few years the first translation into English of the medieval legend on which the play is based.

Characters of Christopher Marlowe’s Dr. Faustus are: Dr. Faustus, Cornelius, Mephistopheles etc.

[Source: Britannica]