Quill, aka Mingling Park, is a human radio show host from Shortwave City that originally was from Shouyinji City. She's the group tough girl and extra muscle as well as the little sister to Sterling. Not only is she a radio show host, but she's also an inventor, too, being responsible for some of the instruments and weapons the group uses to take down the Trivials. Yet her spite towards certain people as her come off as crude.

As a character, she's very blunt and occasionally passive aggressive. She tries to get any job done as soon as possible and hates having so many obstacles standing in her way. Quill is easy to anger and get on her bad side if you push the wrong buttons. Though she cares about the band very much, she has uneasy opinions about Tavi due to her having participated in the Magic vs Technology war decades ago.

In the band, Quill is sort of the mixer of the group, equipped with her mixer gauntlets and a variety of DJ equipment. Though she along with Buttons and Tavi hardly sings (and she's the rarest to do so), adding a singing demo to the audition is optional, but not mandatory! If you do, her singing range is mezzo-soprano to alto.