Suggestions by @rex7567

Walker Scobell

as Lloyd Garmadon in The Dragon and the Oni

Cillian Murphy

as Victor Von Doom in Sozin's Comet

Kevin Michael Richardson

as Lion Turtle in Sozin's Comet

Liu Yifei

as Avatar Yangchen in Sozin's Comet

Yash

as Avatar Kuruk in Sozin's Comet

Fan Bingbing

as Avatar Kyoshi in Sozin's Comet

Hideaki Ito

as Piandao in Sozin's Comet

Kim Jong-soo

as Pakku in Sozin's Comet

Jordan Elsass

as Warren Worthington III in Sozin's Comet

Tom Taylor

as Bobby Drake in Sozin's Comet

Sean Giambrone

as Henry McCoy in Sozin's Comet

William Franklyn-Miller

as Remy LeBeau in Sozin's Comet

Caitlin Carmichael

as Anna Marie in Sozin's Comet

Taylor Kitsch

as Logan Howlett in Sozin's Comet

Skai Jackson

as Ororo Munroe in Sozin's Comet

Sadie Sink

as Jean Grey in Sozin's Comet

Matt Cornett

as Scott Summers in Sozin's Comet

Danny Griffin

as Johnny Storm in Sozin's Comet

Ebon Moss-Bachrach

as Ben Grimm in Sozin's Comet

Emily Blunt

as Susan Richards in Sozin's Comet