passionate, loyal, committed. should be jovial, intelligent, sensual, spiritual, honest and should have wave length matching and brain chemistry syncing, should have credibility, trustworthiness. kindness, caring,Loyalty, Trustworthiness and being passionate are absolute must.
Sincerity and kindness. A good sense of humor and intelligence are up there, too, but the very top thing my partner has to have is a good heart. If they can't empathize with others or care enough to consider other people's feelings then that's just a relationship waiting to get burned.
good sense of humor and down to earth.