In a possible sequel in which they both reprise their respective roles as Barry Allen, The Flash director Andy Muschietti has acknowledged that he would like to work with Ezra Miller once more. Muschietti said on the Discourse podcast, “If [a sequel] happens, yes” (via The Playlist). I don’t think anyone could have done a better job portraying that character. Despite the character’s other excellent characterizations, they really outdid themselves with this one. The two Barrys appear to fit the bill for the character, as you already mentioned.
Several scandals have involved Miller. In a burglary case in Vermont earlier this year, they entered a guilty plea to unlawful trespassing after reaching a plea agreement before the hearing. After a string of legal issues, Miller consented to mental health treatment last year.
Barbara Muschietti offered her opinion on Miller’s portrayal of The Flash, stating, “Ezra was brilliant and the most dedicated and professional [actor].” Ezra gave his all for the part—mentally, physically, and creatively. They were unquestionably superior. Miller gave a stellar performance, and Muschietti agreed during CinemaCon, calling Miller “one of the best actors I’ve ever worked with.” Miller is a fantastic comedian and has all the action needed for such a large spectacle, so he has every tool in the toolbox. Along with Sasha Calle, Michael Shannon, Ron Livingston, Maribel Verd, Kiersey Clemons, Antje Traue, and Michael Keaton, The Flash debuts in theaters on June 16. Additionally, Ben Affleck returns as Batman.