Manners, asking about you, able to have a healthy discussion on emotive subjects, sense of humour, including being able to laugh at yourself, able to split the bills for things you share or take turns, not feeling like you have to fit gender roles ( eg one persons job to earn money and another's to do chores- unless discussed and agrees) doing the small things for each other... eg knowing what one likes and having it ready or suggesting doing it like a drink/meal/bath/book/film to watch though this is prob more romance.
Ability to back one another in front of others.
Respect each other on difference of opinions, not shout at each other or use derogatory words towards one another. Don't put quirks and habits down, just discuss what may irk the other and try your best to make an effort of it is truly offensive to the other person not to do it.
Is this the sort of thing you mean to hear?