Suggestions by @here_for_ideas

The PandaRedd

as Jason Todd in Batman

Chris Barnett

as The Joker in Batman

Tom Ellis

as Nathaniel Essex in Characters Not Yet in the MCU

Coleman Domingo

as Norman Osborn in Characters Not Yet in the MCU

Zeno Robinson

as Harry Osborn in Characters Not Yet in the MCU

Tom Hopper

as Scott Summers in Characters Not Yet in the MCU

Jace Norman

as Noh-Varr in Characters who have not appeared, but should appear, in the MCU

Joe Locke

as Wiccan in Characters who have not appeared, but should appear, in the MCU

Tom Ellis

as Mr. Sinister in Characters who have not appeared, but should appear, in the MCU

Zeno Robinson

as Harry Osborn in Characters who have not appeared, but should appear, in the MCU

Coleman Domingo

as Norman Osborn in Characters who have not appeared, but should appear, in the MCU

Jay Morton

as Jason Todd in Arrowverse fancasting

The PandaRedd

as Red hood in Batman arrowverse

Elliot Page

as Changeling / Morph in All the X-Men Characters