Deltarune Chapter 3 OC, MPSOUND!
From the amazing TV World there were 3 famous superstars: Mr. "Ant" Tenna, Spamton G. Spamton and MPSound!
MPSound is an MP3 device and she was the energy drink everyone needed to cheer the party and bring a lot of fun and emotion to the show, but since Spamton left without a trace, Tenna started to change. As Spamton wasn't there anymore, MPSound and Tenna decided to keep bringing light to the Lightners and Darkners... but that wouldn't last long if the hunger of fame was starting to root. MPSound was the spotlight most of the time as her melodies were such a party! But her attention was too much for Tenna be the second option of many, so he betrayed her and locked her really down this Dark World into a dark room.
Mike (the Mikes) know perfectly where she is so some times they come for a visit to not leave her much behind and make her see she's still loved. In the meantime, MPSound was left in pure darkness with an anger slowly growing for Tenna, the dark desire made a curious voice speak in her ear, its name was Mike, but it was not the Mike she knew...
The lockdown events occured when Toriel took Kris' MP3 as the songs they wanted to see in the Music Channel were locked by a parental lock, Dess left them those songs in the MP3, but Toriel discovered and hid it in the TV cabinet.

PS.: I thought she would be Chapter 3's Secret Boss rather than the Shadow Mantle.

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