Japanese: コーアン
Romanji: Kooan
Residency: Nemesis
Tokyo, Japan (after being purified by the Silver Crystal)

Member of the Spectre Sisters
Cosmetic saleswoman (after being purified by the Silver Crystal)


Petz, Calaveras, Berthier (sisters)


Rubeus, Inner Sailor Guardians (after being purified by the Silver Crystal)


Black Moon Clan
Negamoon Family (English dub)

Gender: Female
Species: Nemesis Humanoid
Human (after being purified by the Silver Crystal)
First Appearance
Anime: Angel or Devil? The Mysterious Girl from the Sky
Anime Voiced By: Wakana Yamazaki (Japanese)
Alice Poon (DiC English dub, episodes 54-57)
Mary Long (DiC English dub, 58-65, 79)
Eden Riegel (Viz Media English dub)

Koan is the youngest of the Spectre Sisters who accompanied Rubeus to 20th Century Tokyo in search of the Rabbit and the Silver Crystal.

Nomenclature & Etymology


Koan is named after Kooankou (紅安鉱), a mineral that is also known as Kermesite and Red Antimony. The "Kermes" part of Kermesite means "Crimson." The Kanji character that is missing is the character for a "mineral" or "ore." Kermesite is found in chocolate as well as other places.


Koan retains the same appearance in the anime as she did in the manga, albeit lacking her rose corsage on her neck. She wears a striped, pink bodysuit with a fluffy purple tutu and blue heels. She has wavy dark purple hair that she lets fall her back, but it is shaped in two points, and she wears a blue gem above her forehead. Like all members of the Black Moon Clan, she has the Black Moon symbol on her forehead.

After she is healed by Sailor Moon, she wears casual outfits and no longer has the Black Moon symbol on her forehead. Her primary casual appearance in both Episode 70 and 71, is a black sleeveless turtleneck, a long light purple skirt, and black flats.


Koan was the most conceited and most ambitious of the Spectre Sisters, as well as the most developed in the anime. She was constantly making up her face, bemoaning her looks, teasing her elder sister Calaveras, and shopping as a human for new cosmetics and clothes. Koan's greatest dream was to become the Queen of Crystal Tokyo - with a King Rubeus by her side. Much of this fantasy was fueled by her belief that Rubeus loved her as she loved him, a fantasy that Rubeus did nothing to discourage.

As the first sister to appear, Koan became the one most engaged in finding Chibiusa (as opposed to simply capturing Crystal Points, which she only did once). This was a job that Rubeus often trusted her with, and the more she failed, the more determined she became to kill Chibiusa and win Rubeus's love.

Koan did not have the same respect for her elder sisters as Berthier, who always referred to Calaveras and Petz as "oneesama" (御姉様). Despite this, she seemed to truly love her determination to purify the others as well.

Koan is the first to encounter the Sailor Guardians. She attacks by shooting Dark Fire upon her enemies.

Koan encountered the Sailor Guardians four times. The first was when she tried to capture Chibiusa Tsukino for Rubeus, but was fought off by Sailor Moon using her scepter. The second time, she tried to take over a crystal point (Hikawa Shrine) with the help of her Droid, Dumbull. Anyone defeated by Dumbull fell under Koan's spell, but Sailor Mars defeated Koan, setting her on fire. The third time, she and her sisters Berthier, Calaveras, and Petz fought the Sailor Guardians but were forced to retreat when Sailor Moon defeated Rubeus.

Koan fell in love with Rubeus at one point, and when he sent her on a mission to take over Rei Hino's temple again, she gave him some cologne, but he was uninterested and crushed it in his hand. Later, he said she was looking "beautiful as always", leading her to believe that he was still in love with her. While chasing after Chibiusa, Koan encountered Rei and Yuuichirou and fought them. Yuichiro jumped in front of Rei to protect her from Koan's Dark Fire. Rei transformed into Sailor Mars. With the help of Tuxedo Mask, she defeated Koan with Burning Mandala. Rubeus appeared and dumped Koan, kicking her out of the team for failing to capture Chibiusa. Koan went on a rampage, and the Sailor Guardians attempted to fight her off, but Sailor Mars protected her from Sailor Jupiter's attack and convinced her to turn good. Sailor Moon used a new technique, Moon Crystal Power, on her to eliminate the last of the negative energy inside Koan, and from here, she opened a cosmetic shop. In the anime, she is kind, jealous and somehow strong.

Koan also convinced Berthier to turn good as well when she attempted to freeze herself with her power. She was later captured along with Berthier by Calaveras and Petz in an attempt to turn them evil, but they turned good in the end, and the four decided to run a cosmetic stand together.





  • Koan's outfit was based on a design by French fashion designer Thierry Mugler.
  • In the DiC English dub, Koan is the oldest of the Spectre Sisters.
  • In the original English dub, she is named "Catsy" or "Catzi", due to the two peaks on each side of her head which resemble cat ears.
  • Koan is the Spectre Sister counterpart of Sailor Mars, as both use fire-based attacks.
  • Koan is forcibly changed back to her evil self by Apsu and is a boss fight in Sailor Moon RPG Another Story. However, she like her sisters seems to still have control of their minds, but their bodies are forced to fight the Sailor Senshi. Also, the Sailor Senshi are forced to kill them. It is unknown if they were revived afterward.
  • She is named after the mineral Kermesite, known in Japanese as "koanko." Among other places, kermesite is found in chocolate.
  • In the DiC English dub that she appears in, she speaks in a flirtatious tone. But in Episode 63 up to 76, she speaks in a Brooklyn accent but a rougher and deeper voice due to her previous voice actress Alice Poon is replaced by Mary Long which she almost sounds like Marge Simpson.

Black Moon Clan
Nega Moon Symbol

Leaders WisemanPrince Demande
Spectre Sisters KoanBerthierPetzCalaveras
Droids Aquatici and Veneti
Other Members RubeusEsmeraudeSaphirBoule BrothersBlack Lady

Leaders WisemanPrince Demande
Spectre Sisters KoanBerthierPetzCalaveras
Droids AtsugesshoNipasDumbullFuraikiJamanenAvocadoraAkumuudaJakokuMaxipanUderingPharmakonDogbarGiwaakuLuax
Other Members RubeusEsmeraudeBlack LadySaphirBoule Brothers

Leaders WisemanPrince Demande
Spectre Sisters KoanBerthierCalaverasPetz
Droids Aquatici and VenetiHyuru Hyuru
Other Members RubeusEsmeraudeBlack LadySaphirSpotted TilmunAaronManna

Leaders WisemanPrince Demande
Spectre Sisters KoanBerthierPetzCalaveras
Droids Aquatici and Veneti
Other Members RubeusEsmeraudeSaphirBoule BrothersBlack Lady

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