Not sure if you're talking about the ID for the actual game.
Yes, it's the actual ID which you have for the actual Elder Scrolls: Online game. It's the one with @ infront of it, which people can use to contact you ingame across factions. It's the one you use in order to send friend requests to others aswell.
Siluen is a difficult one to place, she is not exactly lawful, but she does have her loyalties which are set in stone (to the Ebonheart Pact and her sire), she can sometimes do things on a whim, but due to these things she always follows, she is not entirely chaotic. She is most certainly not one of the good guys, nor would I say she is pure evil, she has the urge to draw blood that comes with her hunger, but she feasts by targeting enemies of the Pact. Therefore I placed her right in the middle of it all, she is such a very balanced person.