Born on a cusp: Pisces-Aries
Pisces is the 12th and final Sign of the Zodiac; Aries is the first. Pisces/Aries are spiritual, often strongly intuitive and are receptive to the collective unconscious. They like to get things started and tend to display strong leadership abilities. Their dedicated and assertive nature lets them eagerly lead the new cycle. Pisces is the Sign of Dreams and Secrets; it represents much that is hidden, both strengths and enemies. Aries is the Sign of new beginnings.
The astrological symbol of Pisces is the Pair of Fish, which reflect the dual nature of life; the two Fish swim in different directions, representing reality and nonreality, consciousness and the unconscious. The astrological symbol of Aries is the Ram. Like the popular conception of the Ram, Aries are able to accomplish a lot by sheer energy and force of will, 'ramming' their way to their goals. In this way, Aries exemplifies the Cardinal quality assigned to it. Pisces, on the other hand, can be indirect and unfocused. Pisceans don't have a strong agenda; they tend to go with the flow and move where life takes them. In this way, Pisces exemplifies the Mutable quality assigned to it. Pisces/Aries are unique in the sense that they are the chameleons of the Zodiac, receptive to the needs of others, but also tending to be about self and ego rather than the balance between people. However, they are not loners.
Pisces is ruled by the Planets Jupiter and Neptune. Jupiter also rules Sagittarius. In ancient Roman mythology, Jupiter (and his Greek equivalent, Zeus) was the king of the gods. Neptune (and his Greek equivalent, Poseidon) was the god of the sea. When the Planet Neptune was discovered, modern astrologers assigned it to be the ruler of Pisces. Neptune is about everything that isn't quite real: illusion and fantasy, drama and art, faith and spirituality. All of these are important to those born under Pisces or on a Pisces Cusp.
Aries is ruled by the Planet Mars. In ancient Roman mythology, Mars (and his Greek equivalent, Ares) was the god of war. He was bold, aggressive, energetic and courageous. Mars was active and high-spirited, full of physical energy and vitality. Aries or Aries Cusp-born reflect Mars's leadership and initiative. Pisces/Aries Cusp individuals are adept at taking the ball and running with it, and projects tend to progress quickly under their guidance. A well-run project may become boring for these chameleon-like folks; they can lack follow-through and lose interest before the project is completed. They are idealistic, but sometimes their dreams are vague and impractical. When reality intrudes, they can become pessimistic or lethargic, but they are very adaptive and broad-minded so they can rework their ideals when necessary.