(Since Stolas is kind of the Scarlet King's adoptive son, I feel like the rest of his siblings would join in Verosika and Vortex during the chorus....everyone, except Rosie....and that Holly duets with Stolas)

https://youtu.be/7rqPpzm47BI

Stolas, Verosika and Vortex as themselves (Holly is dueting with Stolas)

Vermillion Queen, Sayori, Junko, Mukuro, 682 and 999 as the people waving their glow sticks 

https://youtu.be/-nJRdTVqkCo

(What I think Holly would sound like)