P4 - Ami Mizuno's Persona Fontaserena Bright Water

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Name: Fontaserena (Translated from Lunar: Bright Water) Arcana: Temperance
"Said to have been a Goddess of an ancient Lunar Kingdom, her true name thought to be lost. She presided over medicine and intellectual study."
-Persona Compendium

The persona of Ami Mizuno is hinted at being Guardian Mercury in Persona form. Water which pours from the heavens into a vessel, carrying a harp. When Ami accepts her Shadow, her shadow transforms into Fontaserena (Bright Water) - becoming Ami's Persona.

Information Dump Courtesy of the Shin Megami Tensei Wiki:
"I am thou... Thou art I..."
—The line most Personas say upon awakening
"A shadow is suppressed power, and when controlled by one's ego, it becomes a Persona..."
"Shadows are suppressed human thoughts given form…everybody has them inside."

Shadows are malevolent manifestations of one's inner thoughts, while a Persona is a manifestation of the same feelings but tamed and trained by the ego.
When one enters the Midnight Channel, one's innermost secrets materialize and become a Shadow Self which attempts to get its host to accept it. If one cannot accept the Shadow Self, or if they refuse to acknowledge what they want to keep hidden most, the Shadow becomes enraged, attracting all nearby lesser Shadows to itself and transforming into a monster which attempts to kill the person it spawned from. If one can face oneself and admit to what the Shadow Self says, then the Shadow transforms into a Persona loyal to its user.

A Persona is formed by having one's ego master its Shadow, but it is also possible for a Shadow to become a Persona-user by developing its own ego.

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Sailor Moon and its characters are copyright Naoko Takeuchi.
Shin Megami Tensei Persona 4 is copyright Atlus Inc.