Answer:
For me personally, I would want to trust my SO first. Then personality, followed by looks.
Step-by-step explanation:
Trust is important because you need it in a healthy relationship. Keeping secrets will never turn out well.
Personality is next, because if you want an actual relationship, personality is the thing that is going to make it interesting and pleasant.
Looks are last because they're superficial. Wanting a good looking boyfriend/girlfriend isn't bad, but it shouldn't make or break the relationship.
Hope that helps!