Koan

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).

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.

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