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|Affiliation||Neo Venus Ark|
|Anime||All Aboard☆Venus Ark!|
Sieni (シエニ) is a student at Neo Venus Ark (formerly known as Venus Ark).
Sieni has chin-length navy blue hair, with the ends curling inwards. She has strawberry pink eyes, and wears a round blue hat with yellow polka dots and a peach ribbon that resembles a mushroom.
Sieni (シエニ) means mushroom or fungi in Finnish and is also a reference to the hat Sieni wears.