It is pronounced Sim-a-fell. He goes by Sym or Syma for short.
He is a member of The Order of Cherubim, though sometimes he carries out orders under Iophiel who he does happen to have a rather large liking for.
He is largely a rather skilled technician who helps to regulate the system on which heaven runs and is responsible for the creation of various functions including the pit where Lucifer is kept. If something were to begin to go wrong there, he would be one of the angels responsible for accompanying Uriel to fix it, or perhaps simply going alone. He also worked closely with Ruriel during the time of Michael's up-rise.
Though he is primarily a technician, The Order of Cherubim also functions as a reserve army that can be called to its' feet in the event of a crisis, and, like many other angels working in The Order, he is knowledgeable in forms of combat. He prefers long distance encounters, specializing in throwing knives, and is actually rather weak in close range combat. If he is going to need to be closer to a person, he relies heavily on the element of surprise and reaching his target before they realize that there is someone coming for them.
He does have a motto: "Never underestimate an idiot."
There may actually be an entire bio filled out for him in the near future.