The writer Anais Nin had an influential Jupiter in Pisces, amplifying her 5th House Pisces Sun to a surreal degree. Whether you revere or disdain her, she is a brilliant example of an extremely Pisces temperament.
“There were always in me, two women at least, one woman desperate and bewildered, who felt she was drowning and another who would leap into a scene, as upon a stage, conceal her true emotions because they were weaknesses, helplessness, despair, and present to the world only a smile, an eagerness, curiosity, enthusiasm, interest.”
Just as Alejandro Jodorowsky is probably the most Aquarian Man in the world, Anais Nin wins the prize for most Piscean Woman. She had a stellium there – Jupiter, the Sun and Venus. Venus was her ruler as she had Libra Rising. Neptune, the ruler of Pisces, was conjunct her Midheaven, trine the Sun/Jupiter.
Her Venus was also square Uranus. Whether you admire or despise her, she explored all these contradictions poetically and prolifically. The Sun being conjunct Jupiter meant it was amplified. Jupiter in Pisces inflated her Sun and then, via the trine to the Midheaven, helped her channel it to a mass audience.
And, outer planets like Neptune conjunct the Midheaven often mean your creations or image live on after you.