Just one of three people who could have been the central protagonist and made for a much better story.
I would rank him slightly above Basch in that category because he has more development (and the Gabranth plot was not that compelling), and way above Ashe because she is extremely bland. Ashe still would have been a better focus than the one we got, though.
You might need a license to own an assassin/"protocol" droid, in which case I'll just go with Carth Onasi.
there's nothing wrong with Carth other than a little bit of hamfisted early character writing where they really want to let you know that he is mulling over some generic war hero trauma.