The 5 questions I am thinking about right off the bat are:
Can they do the job? Do they have the basic required skills and are they able to go in to detail about their related skills to the position you are working on?
Candidate motivated? Not kicking tires but will do what you ask of them to do in order to make things come together?
Realistic about expectations? Based on your experience on this skill set or by the 10 previous interviews you did you should know if this person is asking way too much for their skill level. What is the market paying for this skill? Are they dramatically over priced? Are they a first year software engineer wanting a CTO salary?
Good references? I hate to work with candidates that do not or will not provide good references. I know they are worried I will recruit their references but I explain to them that I need this information as part of my over all presentation to the hiring manager. That we need to have a level of trust or I can’t really be of service. I explain to them that references are just as key of a marketing piece for them as their resume. As a recruiter I am able to “sell” the great references to the hiring manager at the time of the presentation of the resume. This is when I hope to move the manager towards interviewing the candidate to see about personality fits.
Personality traits? Know what your hiring manager is looking for. Do not send them an introvert that is a perfect skill match but won’t be a match with their team. Even if they hire your candidate they will either eventually quit or will be let go more often than not. You should let your client know you have a skill match but that the personality match is a concern. Let the client decide if they want you to submit them the candidate that way if they don’t like the personality you can always look like the good guy.
Let the candidate know that you are the pro at what you do just like they are at what they do. But that you need to know what sets them apart from their peers. It’s good to know their skills but why are they better? If they can’t answer this about themselves I get concerned. This shows some of their confidence or lack there of. This will be a hurdle in interviewing with the hiring manager.