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It stands to reason that the longer a mermaid is, the more important she is, therefore this long noodle is some form of princess.
She has powers and an outfit on par with a magical girl. Her power is drawn from the moon, with the help of all those round gems on her official ornate princess outfit.
She's a good fella, so she'll grant magical assistance to the worthy who come ask for it. Maybe she'll send you on a quest sometime?
