The single most important attribute would be to be an approachable person.
You can’t underestimate this, particularly if it’s face-to-face tutoring.
When there is someone inviting you into their home and you’re sitting one-to-one with their child.
I think the most important skill as a tutor is to be able to put the student at ease.
That’s the day that they can just focus on learning and not worry about making mistakes with you, not worry about feeling under-confident.
And once that trust’s been built between the tutor and the student, then I find that everything else seems to form much more naturally, providing that the tutor knows what they’re on about (which should be a given).
So, being able to put your students at ease is the single most important attribute.