Zirconia (ジルコニア, Jirukonia) appears as an old woman with lavender skin who is revealed to be a be manifestation of Queen Nehelenia, overseeing the Dead Moon Circus in the real world.

In the Materials Collection, Naoko Takeuchi mentions intentional insect-like elements in her design, possibly a reference to insect genus Nehalennia.

In the anime, Zirconia serves as the queen's representative in directing their followers on missions to find Pegasus in the beautiful dreams of people in Tokyo.

Nehelenia used her final moments of freedom to curse the Moon Kingdom to fall before Princess Serenity could take the throne, making her the cause of Silver Millennium's destruction.

As a result, Nelehenia became obsessed with the notion of keeping herself young and beautiful so she consumed the dreams of her subjects, who became Lemures, and founded the Dead Moon Circus.

Nelehenia sought the Golden Crystal possessed by Helios, who escaped her in the form of Pegasus, only to be later sealed by Queen Serenity within her mirror.

To rectify her condition, during the events of the SuperS series, Nelehenia creates Zirconia to lead the Dead Moon Circus to hunt down Pegasus.

Eventually learning of Helios's close friendship with Chibiusa, Nehelenia realizes that she is the holder of the Golden Dream Mirror that Pegasus is inhabiting.

Tiger's Eye, in animal form, first assisted PallaPalla and VesVes in flushing out Usagi and Chibiusa when the latter's attempt of returning to her time is detected.

He later gains human form and assists PallaPalla by subjecting Sailor Mars with her nightmare while she investigates a mysterious hall of mirrors.

[8] Sailor Moon Eternal has Tiger's Eye's dream of becoming an artist and he retains his human form even after Rei uses her “Exorcized Charm”, attack on him.

In the anime, his targets of seduction are particularly younger women, as he uses his charming abilities to lure them into his traps until the right time to look into their dream mirrors in search of Pegasus.

Creator Naoko Takeuchi characterized Hawk's Eye as a sort of grown-up Zoisite, with the dream of someday being a "bar madam" in either Las Vegas or Ginza.

[10] Hawk's Eye deceives Makoto by pretending to be a female owner of a herb store, referred in non-binary terms in Sailor Moon Eternal, to give her and Chibiusa rings to inflict them with nightmares.

[17] They had been placed in a deep sleep somewhere within the Amazon Jungle, awaiting the time when they could become the future protectors of Sailor Chibi Moon, analogous to Princess Serenity's four Inner Guardians and to Prince Endymion's four Four Kings of Heaven.

In the anime, the Quartet's history of being Sailor Guardians is never shown to viewer and the story is followed after they are captured by Queen Nehelenia and is already a part of her Dead Moon Circus.

Nevertheless, she shows some signs of cleverness, such as pointing out that the arrangement of the curtains is wrong in one episode (when no one else saw it), setting up a popular dentist office in another, and using a doll to manipulate the Sailor Guardians in yet another.

Xenotime (ゼノタイム, Zenotaimu) and Zeolite (ゼオライト, Zeoraito) are knife-throwing twins who, after the failures of the Amazon Trio, volunteer their services to the Amazoness Quartet.

The participants, encouraged by the folk of the Dead Moon, become aggressive and fall prey to the Lemures but Sailors Mercury, Mars and Jupiter intervene before the same can happen to Minako, who has not received a power-up.

Xenotime and Zeolite are voiced by Yohei Azakami and Ryohei Arai respectively in the two-part Crystal film Sailor Moon Eternal.

In the manga, the Lemures (レムレス, Remuresu) are physical incarnation of nightmares conjured by the Amazoness Quartet, in the form of small, dark, round, fuzzy creatures.

They do not act independently and members of the Dead Moon Circus would call upon large groups of them to attack their victims and drain their energy.

In the Pretty Soldier Sailor Moon SuperS ~ Dream Guardians - Love - Into Eternity... musical, a group of clown-like Lemures called Pierrot appeared.

These three Lemures are also made members of Shadow Galactica in Shin Densetsu Kourin, when Sailor Galaxia forced the Amazon Trio into her service.

While reviewing shinto, feminism and anime, author Sarah Reeves considered that Queen Nehelenia's overall misconduct and strategies are the result of a lack of husband and children.

[23] In her response to an academic essay on Sailor Moon by Mary Grigsby, author Emily Ravenwood noted the feminine traits of the members of the Amazon Trio, with Hawk's Eye having "what look remarkably like breasts under that little chest toga", Tiger's Eye having "some noticeable hips", and Fisheye being "the most ambiguous; he looks feminine but is also far too aggressive to fit the typical parameters of femme.

The Lemures were praised, while the Amazon Trio were described as "the real saving grace of this season," no matter in which language the viewer is watching the series.

While analyzing the Amazon Trio's outfits, the author wrote they "might leave a little something to be desired," with Hawk's Eye in particular being portrayed masculine despite wearing a skirt, which is "relatively progressive for the time.

"[27] Several reviews focused on Dead Moon's ability to attack the Guardians by exploiting their deepest fears, with Jade Gomez from Paste stating that Zirconia sends the Amazon Trio "to get inside the minds of the Sailors to take them down,"[28] Victoria L. Johnson from Polygon describing how the Guardians "are attacked by the Dead Moon Circus, who prey on their false fears and real insecurities,"[29] or Arius Raposas from Medium writing that "the original four (Mercury, Venus, Mars, Jupiter) ... were tormented by the Dead Moon Circus in their attempt to trim down the forces of Princess Serenity.

[31] By contrast, Lynzee Loveridge from Anime News Network wrote a less positive review of the film and noted that the Dead Moon Circus is the films' "biggest casualty", which also applies to all previous villains' groups from Sailor Moon Crystal, since the manga did not dedicate time to develop secondary villains like the Amazon Trio.