Ask HN: What Are the Qualities to Look for in a Co-Founder?
If you were looking for a co-founder and knew 30-40 people, what 3-5 personal qualities would you use as criteria to stack rank them as options? Given those, what is one dealbreaker?
Easy for non-technical co-founders especially to talk big. Also, talk to users or co-founders that worked with them, and under them.
Unfortunately you can't really determine these quickly, you pretty much have to know the person first. Public or second-hand reputation unfortunately isn't always trustworthy.