Meet Shadow Sapphire :)

She is part of a music group called the Stomettes, a group of ponies made up from territories taken over by the Storm King, who then impersonated popular singers go from Equestria in order to be used as propaganda and boost morale, so other lands think they are the real deal.

She is based of Sapphire Shores :)

She is the most bombastic and energetic of the group, and also serves as the only member of the group that can actually dance. She often gets up to a lot of chaos and hijinks, much to the dismay of the group and everyone else around her. Also can be quite the lewd and inappropriate pony too xD

However, she is not the brightest pony around, as she can be very easily manipulated, and is very gullible.

After the fall of the Storm King, she would end up working for the real Sapphire Shores, as she would get a job as a dance instructor for her studio.