Suggestions by @maytheforcebewithu

Sam Witwer

as Ocean Master in Young Justice

Sam Witwer

as Orm Marius in Aquaman (Arrowverse)

Blake Ritson

as Brainiac in Crisis on Infinite Earths

Sadie Sink

as Gwen Stacy in Your Friendly Neighborhood Spider-Man (live-action)

Sean Pertwee

as Alfred Pennyworth in Batman and Robin (Arrowverse show set after Batwoman)

Katherine McNamara

as Barbara Gordon in Batman and Robin (Arrowverse show set after Batwoman)

Anna Lore

as Stephanie Brown in Batman and Robin (Arrowverse show set after Batwoman)

Robert Knepper

as Joker in Arrowverse Batman television series

Lou Ferrigno Jr.

as Skaar in Hulk and the Agents of S.M.A.S.H.

Katherine McNamara

as Barbara Gordon in DCTV and Arrowverse's Sorceress of Magic

Cole Sprouse

as Dick Grayson in DCTV and Arrowverse's Sorceress of Magic

Dylan O'Brien

as Dick Grayson in DCTV and Arrowverse's Sorceress of Magic

Mark Justice

as Hal Jordan in DCTV and Arrowverse's Jade Warrior

Matt Lanter

as Hal Jordan in DCTV and Arrowverse's Jade Warrior

Lynda Carter

as Queen Hippolyta in DCTV and Arrowverse's Wonder Woman

Maisie Richardson-Sellers

as Julia Pennyworth in DCTV and Arrowverse's Batgirl Series

Dylan O'Brien

as Barry Allen in Teen Titans Vs. Justice League DCEU (2018)

Timothy Olyphant

as Bastion in X-MEN '97

Cole Sprouse

as Dick Grayson in The Batman| Arrowverse Series

Brenton Thwaites

as Nightwing in Post-Flash DCEU