The concept is interesting. The execution is good, but not great. While the board has a knee jerk reaction to all assassins, this one is not so stereotypical that we will just keep saying "we hate it."
I personally would want some information about the character's personality and the personas he puts on in his various guises.
The Background story says more about what he does, than how he got that way... so some more history background would be nice... more details on how he got that way. We need to know why he does what he does, does he like it or is he doing it because it is a family obligation, is he just sick, what is going on. Even if you update the background story, you need to keep his process (the existing text) included. Go to Comment
I like the idea, the basis is reasonable and contains potential.
A few questons, however:
Why would Sadis, who appearently has no use for allies or friendships, especially those that may expose him, keep Gnome-y around?
Though we know he is grredy, does he have any characteristics that would cause him to do things?
Does Sadis have long term plans? Making a big hit? Getting married, settling down? Go to Comment