Ideally I would want somebody who could bring strong readily usable skillsets. Two other long time friends-advisors (one in software marketing, one a software whiz) both have heavy constraints against making a risky move such as joining a startup.
I have some very strong strengths and some very strong weaknesses. The thought behind going for this friend is, if I can't find somebody I trust, who can bring strong strengths along with being able to counter my weaknesses, I might as well as bring somebody in who can counter my weaknesses. And this guy can do at least that, if he is willing to join and really contribute.
Unfortunately, one of my weaknesses is building rapport quickly with people:). I am working on it, but can't bank on becoming good at it fast enough to build a good team quickly.