Suggestions by @curtissummers

Daniel Radcliffe

as Harry Potter in YGO: Kingdom Hearts: Harry Potter and the Cursed Child

Freddie Highmore

as Lightning Anthony Michaels in YGO Kingdom Hearts: Pokemon Pocket Monsters: Orange League

Christien Anholt

as Mewtwo in YGO: Kingdom Hearts: Pokémon - Pocket Monsters: Mewtwo Strikes Back

Christien Anholt

as Brock Harrison in YGO: Kingdom Hearts: Pokemon - Pocket Monsters

Christien Anholt

as Kent Mansley in The Iron Giant

Brian Cage

as Brock Harrison in YGO: Kingdom Hearts: Pokemon - Pocket Monsters

Athena Karkanis

as Misty Williams in YGO: Kingdom Hearts: Pokemon - Pocket Monsters

Kath Soucie

as Elaine Blossom in YGO: Kingdom Hearts: Pokemon - Pocket Monsters

Andrea Libman

as Chase Kirby in YGO: Kingdom Hearts: Pokemon - Pocket Monsters

Matthew Lillard

as Lt. Surge in YGO: Kingdom Hearts: Pokemon - Pocket Monsters

Wayne Brady

as Brock Harrison in Pokémon: Indigo League (Uncut and Redub)

Carolyn Lawrence

as Misty Williams in Pokémon: Indigo League (Uncut and Redub)

Wesley Singerman

as Ash Ketchum in Pokémon: Indigo League (Uncut and Redub)

Justin Long

as Ooblar in YGO: Kingdom Hearts: Jimmy Neutron: Boy Genius (Live Action/Animated)

Elton John

as King Goobot V in YGO: Kingdom Hearts: Jimmy Neutron: Boy Genius (Live Action/Animated)

Shayle Simons

as Sheen Estevez in YGO: Kingdom Hearts: Jimmy Neutron: Boy Genius (Live Action/Animated)

Shahadi Wright Joseph

as Libby Volfax in YGO: Kingdom Hearts: Jimmy Neutron: Boy Genius (Live Action/Animated)

Keegan Hedley

as Carl Wheezer in YGO: Kingdom Hearts: Jimmy Neutron: Boy Genius (Live Action/Animated)

Brooklynn Prince

as Cindy Vortex in YGO: Kingdom Hearts: Jimmy Neutron: Boy Genius (Live Action/Animated)

Vanessa Hudgens

as Tiifu Jr. in YGO: Kingdom Hearts: Jimmy Neutron: Boy Genius (Live Action/Animated)