Orthrus is the evil part of the clan's creation.
Alone with the other two creators, he assists in keeping the Celestials together, yet does it, and other things in his own sinister way. For if there isn't enough balance among the Celestials, it will truly fall into chaos and disrepair. A few of the Celestials help keep the peace throughout themselves and the mortal realm. Others, such as Orthrus, thrive in making things just a bit more uncomfortable and challenging for everyone. For some strange reason, it just pleases him greatly. Orthrus has been known as the Celestial of the Damned, the Unworthy, and even Evil. Those are just folk tales though, right? No, they are all true. The Celestials keep a close proximity to the mortals to make sure they get all of the facts correct. Orthrus is not the immortal that you want to piss off, just keep that in mind.
In mythical depictions, Orthrus has dark grey eyes that have the ability to turn mortals to stone. He is usually seen shrouded in darkness with a blood red glow surrounding him. He wears a black cowboy hat and matching suit and boots. Wings of pure darkness, rage, and fear stretch out from his back.
Orthrus has been such a wicked deity since he met the others, each on separate days, of course. He knew Ang first, then met Oracle, then Blackheart, then Saintblue, and lastly, Celestia. They are each important to the sensitive ecosystem that is their immortal group. It was all of them, together, except Celestia, that decided to choose an earthly realm to rule over, but Orthrus, Ang, and Saintblue did a lot more work than the others in the beginning. Then, Celestia came to them and offered herself and a great service to the other immortals, as a goddess of peace, harmony, serenity, etc. to which they almost couldn't refuse. They were more than happy to add another immortal to themselves, the Celestials!