Suggestions by @palamepaj

Peter Griffin

as Celtic in Characters by heritage

Johnny Bravo (Character)

as American in Characters by heritage

Patrick Star

as American in Characters by heritage

Daffy Duck

as American in Characters by heritage

Homer Simpson

as American in Characters by heritage

Fred Flintstone

as American in Characters by heritage

SpongeBob SquarePants (character)

as American in Characters by heritage

Goofy

as American in Characters by heritage

Eric Cartman

as American in Characters by heritage

Mickey Mouse

as American in Characters by heritage

Bart Simpson

as American in Characters by heritage

Zilla

as Japanese in Characters by heritage

Mecha-King Ghidorah

as Japanese in Characters by heritage

Godzilla (Monsterverse)

as Japanese in Characters by heritage

MechaGodzilla

as Japanese in Characters by heritage

Gloria Delgado-Pritchett

as Latino in Characters by heritage

Luz Noceda

as Latino in Characters by heritage

Dora the Explorer

as Latino in Characters by heritage

Ed (Ed, Edd n Eddy)

as Canadian in Characters by heritage

Johnny Test (Character)

as Canadian in Characters by heritage