There's enough potential grief in a trip, I wouldn't feel the need to start out with a load of it already.
If I were to hit the road for days or weeks with another human.... they'd better have the same sort of ideas of what will stop and start the ride as me. I wouldn't be interested in someone who whines more than me.... same as they shouldn't have to bear it if I whine more than them.
Someone who rides the same general pace as me. Is willing to run the same levels of risk. Enjoys the same sorts of roads. Deals with traffic in a manner I can understand and anticipate.
A good, easy sense of humor. I'd also want their bike to be as reliable as my own........ and have the funds to cover the trip at whatever level of luxury we had previously agreed to.
If all that were in place, a flat, or a crash..... that's part of the adventure.