I'd look for a sign hanging around his neck: "I am not a total loser". That'd be a sign that he has a sense of humor, at least."

Really, generate a list of attributes you admire, and look for people with those attributes.

The best scientific studies (surveys, generally) show less than five percent correlation between what signs people are and what attributes they should have. This is lower than the fraction of people who know what they should be. This suggests that your date of birth has little to do with what kind of person you are. It's your choices that matter most.

The best use of astrology, tarrot card reading, etc., that i've encountered is as a meditation. You test each prediction against reality. Reality is reality. Sometimes shaking things up a little randomly can give you clearer insight into the way things really are. But blind believe is going to get you random results. Remember that half of the guys out there are below average.