Suggestions by @axiomman

Ron Perlman

as General Evander Bishop in Gamera: Guardian of the Universe

Ron Perlman

as General Evander Bishop in Godzilla: Atomic Age

Mana Ashida

as Emi and Yumi Miana in Godzilla: Reign of the Monsters

Antonio Banderas

as Mateo Aguilar in Mothra

Diego Luna

as Juan Barrera in Mothra

Anguirus (Angirasu)

as Anguirus in Godzilla: Reign of the Monsters

Behemoth

as Behemoth in Godzilla: Reign of the Monsters

Varan

as Varan in Godzilla: Reign of the Monsters

Mothra (Mosura)

as Mothra in Godzilla: Reign of the Monsters

Naomi Scott

as Dr. Anna Charlton in Godzilla: Reign of the Monsters

Andrew Koji

as Ken Tanaka in Godzilla: Reign of the Monsters

Anthony Ramos

as Randy Hernandez in Godzilla: Reign of the Monsters

Grant Gustin

as Nick Tatopoulos in Godzilla: Reign of the Monsters

Godzilla

as Godzilla in Godzilla: Reign of the Monsters

Kumonga

as Kumonga in Godzilla: Reign of the Monsters

King Ghidorah (Kingu Gidora)

as King Ghidorah in Godzilla: Reign of the Monsters

Rodan (Radon)

as Rodan in Godzilla: Reign of the Monsters

Hiroyuki Sanada

as Daisuke Tanaka in Godzilla: Reign of the Monsters

Satomi Ishihara

as Miki Serizawa in Godzilla: Reign of the Monsters

Baragon

as Baragon in Godzilla: Reign of the Monsters