Those with similar interests. Preferably the adventurous type. People who can understand complex problems and seek answers to them. People who have strong emotions, and those who can relate to the emotions felt by others. I believe that a strong sense of empathy is part of what differentiates the 'good' from the 'bad' individuals. Also, you must have a fundamental belief in human rights and a desire to see them given an increasing importance in our supposedly modern world.