Moss is a figure unique to the Sailor Moon stage musicals, cast as the final royal heir of the Grimm. She lives in Tokyo behind the human name Seika Hoshino and attends Mugen Academy, first stepping onstage in the Mistress Labyrinth production of the Sera Myu run.
Across the musicals, Moss circulates through Tokyo under a borrowed civilian identity, going by the name Seika Hoshino. In that guise she is placed among the pupils of Mugen Academy rather than presented in any openly royal form.
The productions align her with the Grimm, and her defining trait is her rank as the last surviving princess of that line. Little else about her disposition is drawn out on stage.

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Moss is a character unique to the Sailor Moon stage musicals, portrayed as the final royal heir of the Grimm line.
Moss goes by the human name Seika Hoshino while living in Tokyo, where she is enrolled as a student at Mugen Academy.
Moss debuts in the stage production Pretty Soldier Sailor Moon, Mugen Academy, Mistress Labyrinth, part of the Sera Myu musical continuity.
The role of Moss was performed by Atsuki Ishiguro in her debut production.
Moss is aligned with the Grimm and is defined by her rank as the last surviving princess of that royal line.
Looking for more on Moss? The Dragon Ball Wiki on Fandom has a dedicated page with community notes.
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