It's been a mystery amongst Love Live! fans as to how the high school idol units are able to get backing tracks for their songs when none of them are known to have any experience producing content (the closest would be Maki, but she only plays a traditional piano). D4DJ features units whose members do produce synthesized music, so it would not be a stretch to assume that the likes of Happy Around! and Peaky P-Key are providing the backing tracks for μ's, Aqours, et al., likely in an Uncredited Role or at least only getting credit in the in-universe liner notes so as not to draw attention away from the idols.
And she wants to join him in un-death.
One of her hobbies is retro video games, and when she's not making tracks for Merm4id, she does solo remixes of video game classics.
Though in that case, it would likely go beyond childhood nostalgia and into being a Fan of the Past, since she's stated to be 20 years old at most (she makes it a point in one event that she and her unit-mates can't go to a casino because they're under 21), and given that the series seems to be set in the 2020s given the use of modern-day slang and technology, she would not be able to claim the likes of Darius and OutRun as childhood favorites.
