Sparkle/Hanabi’s seiyuu is Reina Ueda, which is the same seiyuu as Akane Shinjo from SSSS.Gridman. And not gon lie, I love how similar she sounds to Akane. Might pull for her just because of her voice.
So I wondered why Black Swan who is aligned with Remembrances utilizes Nihility, until the thought occurred that she is a case of a fortune teller who is mildly manipulative in her work. Also Sparkles already presenting herself to represent Elation with her Harlequin personality. Poor Owlbert.