Name: Adamant Bell (this is his post-Exaltation sobriquet; he does not go by this yet)
Caste: Eclipse
Totemic Anima Banner: A giant bell that bobs and rings as he moves and swings his weapon
Origin: The Realm/House Mnemon/The Immaculate Order
History: Mnemon Rethay spent his early life in school, growing up as a son of the great sorceress Mnemon, leader of the great house of the same name. The blood of the dragons was strong with him; so much so that he experienced some of the dragon's blessings long before the usual time when a terrestrial exaltation would have been expected. But the years went on, he trained as a Dynast, and he passed his twentieth birthday without ever receiving the blessing that just fifteen years before had seemed a foregone conclusion.
Rethay had disappointed everyone: his mother, his great house, and especially himself. After a bit of soul-searching, he decided to join the Immaculate Order, where he might learn why the dragons had so denied him. His ambition was unmatched, even by the vastly more powerful dragon-bloods: Rethay managed not only to awaken his essence, but to attain the unheard of heights (for an unexalted mortal) of starting to learn a Celestial martial art within a few years of joining the order (which would be extremely good even for a dragon blooded). He was sent into the Threshold to support the Order and the Realm in Greyfalls.
What the Order didn't know is that Rethay had found the answers he sought soon after joining: the Unconquered Sun had chosen him as one of his heroes. Rethay stayed on in the Order, sure that any day he would be killed as Anathema. He was careful to never reveal his Anima, and somehow (with the help of a certain Gold Faction spymaster) he managed to remain undercover. His relief was great when he was sent out of the Realm; he now serves as a spy in Greyfalls for his sifu.
Motivation: To peacefully reconcile the Realm (or at least House Mnemon) with the Solar Exalted.
Intimacies: Rethay does not wish to betray the Realm, even though he would be hunted as a demon if anyone found out his true nature. Rethay respects the lifestyles of mortal Immaculate monks, even though he thinks they are misguided. Rethay will not allow his monk's robes to be damaged. Rethay cannot stand to see innocents harmed over questions of religious dogma.
Backgrounds: Adamant Bell has a Sidereal Sifu(3), some pull with the Cult of the Illuminated(1 or 2), as well as a small amount of income (Resources 1) from the same. He has won over a few mortal monks with his skill and charisma (Followers 2), and they would follow him even if his status as one of the Unconquered Sun's chosen were revealed.
Abilities: Adamant Bell knows a Celestial martial art. The Earth Dragon style would be most appropriate, provided that is allowed (I have a list of prerequisites for the charms of this style; the charms themselves are given in the storyteller's guide).
Future development: Adamant Bell will probably be outed as a Solar early on, but he should eventually convince a number of dragon-bloods to follow (or at least accept) him. Members of the Immaculate Order will react strongly to him, one way or another, for wielding their sacred and secret arts. They may see him as a pious Anathema striving to overcome his dread curse, a horrible corrupter who profanes the holy dragons with every move he makes, a test to see if the Order really acts as the Immaculate Dragons wish, etc.
Other details: Rethay is out of contact with his family. If he could somehow convince Mnemon to accept him, he would become wrapped up in very complicated power politics. On one hand, this would give him access to great wealth and resources. On the other hand, his relatives would likely seek to control him, possibly blackmailing him.