Mephistopheles (MotRD)

A fiend calling itself Mephistopheles was summoned to Gothic Earth by Wolfgang Armand Faust. Mephistopheles convinced Faust to sell him his soul in order to have more time walking the earth. Mephistopheles has interpreted this creatively, trapping Faust in an endless reincarnation loop. Unlike many creatures summoned to Gothic Earth and unable to return, Mephistopheles revels being there thanks to the evil of the Red Death. it is possible that Mephistopheles is a member of El Siete Note that this "Mephistopheles" was never given 3rd Edition (nor ever given any stats to begin with), so any creature types below are speculative.

More on this character at at Wikipedia