My advice is to follow your instincts- what you feel matters the most.
I think we all have preferences and approaches we prefer. What would necessary be someone I would connect/click with might not be someone you might feel comfortable with.
I go by how I feel, not necessary by a checklist or otherwise I am just going to overthink the situation which will probably make me more anxious. I would say go in tomorrow with a open mind because it will help relax you. I think when I have felt relief with someone, its not them meeting a certain criteria but because I felt safe with them and that is a big thing.
Some good qualities in someone-competent, integrity, compassion,openness,trustworthy, approachable,flexible,honest,friendly, professional and engaging.
I am just really good at reading people- and following my instinct is what I go by the most. Goodluck for tomorrow.