Auditon (sort of) for Methos
Name: Methos (Aka Adam Peirce)
Age: 5000 at best guess
Looks:

Affiliation: Himself, nominally good.
Personality: Usually pretty unsympathetic to the plights of others, he nevertheless helps out when he has to. He prefers to stay low profile, and out of fights for his head. Survivng has become an art for this immortal. Cunning, he is not beyond tricking people into doing what's nessacary or fighting dirty.
History: Once a member of the Four Horsemen, Methos helped cut a swathe of destruction through history as Death. This alone would have been enough to secure his legend. Exactly where and when he came from no one knows and Methos claims to be unable to remember, making his exact age and origins impossible to determine, although it is genrally accepted that he was born in Egypt at the beginning of that great civilisation's reign.
Although he has no medical degree that we know of, Methos has played the role of a doctor at least since the 1800s; perhaps he would have continued in this if the Watchers hadn't redoubled their search for him. Sometime in the last ten years Methos has conned his way into the watchers themselves and even secured his place as the top dog on the Methos Project - neatly keeping his own existence a secret.
Other: It's possible, given their respecitve ges and origins, that Methos has met Jeremiah Lazarus before.