It's simple: both of these fixed signs are leaders that want to make a difference. Leo is performing on stage, while Aquarius is running the stage craft. Leo is a one-man show, and Aquarius stands by the people. The lion expresses its individuality in a physical (fire) way, while Aquarius takes the lead in a social (air) way. These two can really help each other, and learn from each other's passions. Leo teaches Aquarius love and affection, while Aquarius shows Leo the beauty in intellectual stimulation.