Suggestions by @dagenspear

Sarah Shahi

as Hawkgirl in Dc Universe Recast

Chiwetel Ejiofor

as Martian Manhunter in Dc Universe Recast

Oscar Isaac

as Green Lantern in Dc Universe Recast

Aaron Taylor-Johnson

as Flash in Dc Universe Recast

Joaquin Phoenix

as Arthur Fleck in Joker Sequel

Ewan McGregor

as Captain James Gordon in Joker Sequel

Ariana Greenblatt

as Holly Robinson in Joker Sequel

Kenneth Branagh

as Alfred Pennyworth in Joker Sequel

Lindsey Morgan

as Selina Kyle in Joker Sequel

Tom Bateman

as Bruce Wayne in Joker Sequel

Lyndsy Fonseca

as Zoe Lawton in Connor Hawke (Arrowverse)