Sailor Lethe and Sailor Mnemosyne only appeared in the Sailormoon manga. They guard the rivers in Shadow Galactica.
Sailor Lethe is the guardian of the River of Oblivian, which is part of the Zero star of Saggitarius. She comes from the planet Lethe.
Sailor Mnemosyne is the guardian of the River of Memory, also in the Zero star of Saggitarius.
The pair's only known attack is "Galactica Musotis Alpastonis!" and Lethe uses it against Sailormoon and causes her great pain. They side with Sailormoon after realizing their mistakes but are soon killed by Phi and Chi.

After stealing human starseeds, she would turn their souls into butterflies because she had a great love for the winged creatures. She also has large butterfly wings herself.

Sailor Chi and Sailor Phi, these two are nothing but pure evil. They serve Galaxia and have no sympathy for anyone. They kill Sailor Lethe and Sailor Mnemosyne as well as Kakyuu

She looks like a cat with a headpiece adorned with pointed ears. Although she may seem cute, she is an evil character who always fought with Lead Crow.

She is friend/partner to Aluminum Siren, helping her as a teacher. According to the manga, she is killed by Sailormoon. In the anime she is killed by her next partner, Tin Nyanko.

A silly girl who discovers the identies of the inner senshi and starlights, but is killed by Galaxia before the information can be revealed.

The first animamate to appear, Iron Mouse is a cute and comical character. She is quickly ridded by Galaxia though for repeated failures.