On the other hand the archive is a good place to go for some general inspiration, you can instantly see what kind of builds have been 'done to death' and look for any 'gaps in the market'...
Vaz's advice is good though, you shouldn't write up a pure thief just because we don't have many. Make sure you're having fun with the character because if you're not it will be very noticeable when you do the write up...
My ideas on this:
What do you mean by BUILD? You seem to use it pretty liberally. You mean concept? Gameplay? Skillset? Description?