For Aries the Sun holds powerful creative urges.
For Taurus, he holds challenges for depth of self-identity and inner happiness.
For Gemini, he extends a challenge of willpower
For Cancer, he makes the family the center of identity
For Leo he is the self.
For Virgo he extends a challenge for humility and selflessness
For Libra he holds challenges not losing oneself in the social environment
For Scorpio he holds challenges with bosses and public authorities
For Sagittarius he roots the identity in morality
For Capricorn he challenges a positive self-image, and reveals the shadows
For Aquarius he challenges a healthy inter-dependant lovelife
For Pisces he holds power to examine and conquer the self
The logic? The Sun is always connected to identity, and is the source of power and focus in life. The Sun owns Leo. For each rising sign, Leo constitutes a different house. For Aries, Leo is the 5th house, for Taurus the 4th, Gemini the 3rd, etc. I have crafted the above descriptions by blending the inherent nature of the sun with the house he owns for the given rising sign.
– Vic DiCara