Mephistopheles

Mephistopheles, also known as He Who Abhors the Light, bears two Sacred Artifacts. One is a Mirror that reflects light, while the other is a Contract that can bind the souls of others with its language. Souls are, after all, little more than data, and data is, at its core, merely a form of light. Mephistopheles has had two masters in the past: one was the ruler at the very summit of Gehenna's order, whose position Mephistopheles himself is authorized to fully represent as agent; the other is the human who summoned him to Tokyo, and as a demon, Mephistopheles wishes for nothing more than to finally drag down this only human specimen who's ever escaped Gehenna with an uncorrupted soul. Both of these masters can be found in one form or another here in Tokyo, though Tokyo's System is such that only one summoner per Transient is permitted, creating something of a loophole situation. And it's through this loophole that two Mephistopheles figures are allowed to exist within the city, which likewise gives him the opportunity to forge new bonds with his former demon acquaintances from Gehenna."