Sailor Phi (SMCU)

Sailor Phi (Φ) is one of the Star Gardeners and a member of Sailor Galaxia's Shadow Galactica Legion. After Galaxia was purified at the end of the Second Sailor Crusade, Phi later faces and rejoins Galaxia as a member of the Galaxia Troops.

She is the twin sister of Sailor Chi.

Prior to the Cinematic Universe
During the inter-Crusade period, Sailor Phi and her twin Sailor Chi are the seconds-in-command of the Shadow Galactica Legion, and Galaxia's most loyal followers. They were in charge of cultivating the Star Seeds - tapping Garden Crystals which surrounded Galaxia's cathedral.

Darkness Returns
The Star Gardeners along with twins Sailor Lethe and Sailor Mnemosyne are the four mystery Senshi responsible for the theft of the Sword of the Silver Crystal in order to revive several villains the Sailor Senshi had faced in the past.