Appearing only in the manga and musicals, Sailor Phi, along with Sailor Chi, may be Galaxia's most loyal servants. She is named after one of the letters of the Greek alphabet, represented by the symbol Φ (Phi).
The two share similar outfits; Sailor Chi's outfit is green, exposes her midriff, and features a long skirt with thigh-high slits. In contrast, Sailor Phi's outfit is red, covers her midriff, and includes pants. Each wields a staff topped with a sun symbol, which they use in combat. Sailor Phi also employs an attack known as Galactica Plants Blizzard.
The duo is referred to as the Starseed Gardeners or the Garden Crystal Senshi, tasked with overseeing the starseeds stored in the gardens surrounding Galaxia's palace. They act as Galaxia's messengers, monitoring her other servants and reporting on their activities. Sailor Phi makes her first appearance in Act 45, reporting Sailor Aluminum Siren's failure. Sailor Chi appears later, in Act 48.
Sailor Chi and Sailor Phi are responsible for the deaths of all three Sailor Starlights, Princess Kakyuu, and likely many others. They are ultimately defeated by Eternal Sailor Moon in Act 49, but not before significantly boosting Sailor Galaxia's power.
