Coatl, a comet featured in the Sailor Moon stage shows, plays into the Kaguya Island storyline. Envious that the Solar System outshines it, the comet steers toward a collision with Earth, and only Princess Serenity's intervention prevents a direct hit.
Coatl is not a person but a comet streaking through the musical's sky. Its name comes from Nahuatl, the language in which the word means serpent.
The stage story hands the comet a bitter, envious streak. It cannot abide that the worlds of the Solar System shine more brilliantly than it does.
Driven by that resentment, the comet hurls itself toward Earth, bent on a collision. Princess Serenity steps in and bends its orbit aside to avert the catastrophe, but the rescue is not without cost: the altered course still whips up a colossal tidal wave, and that flood drowns the earthly kingdom of Artuka.

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Coatl is a comet featured in the Sailor Moon stage musicals, playing into the Kaguya Island storyline. Envious that the Solar System outshines it, the comet steers toward a collision course with Earth.
The name Coatl comes from Nahuatl, the language in which the word means serpent.
In the stage story, Coatl is given a bitter, envious streak because it cannot stand that the worlds of the Solar System shine more brightly than it does, so it hurls itself toward Earth aiming for a collision.
Princess Serenity intervenes and bends Coatl's orbit aside to avert a direct collision with Earth, though the altered course still whips up a massive tidal wave.
Even though Princess Serenity redirects the comet Coatl away from a direct hit, the tidal wave stirred up by its passing still floods and destroys the earthly kingdom of Artuka.
Looking for more on Coatl? The Dragon Ball Wiki on Fandom has a dedicated page with community notes.
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