This is the 1st in a series that will track actors from the various Godzilla movies and shows over the years through to Godzilla, Final Wars (2004), the 2014 Godzilla movie being too recent to cover. All known cast members listed. Info derived from imdb. Only roles 2013 and later being tracked.
This covers the first Godzilla movie, Godzilla (1954), aka Gojira. Cast also in Godzilla, King of the Monsters (1956), the Americanized version noted in the character name. Cast unique to the 1956 Americanized version noted below the main entry.
Akira Takarada (Hideto Ogata; US: Ogata): in Tôi yakusoku - hoshi ni natta kodomotachi (2014), Godzilla (2014), A Sparkle of Life (2013), Kingdom Hearts HD 1.5 Remix (2013 video game); Keiseisaimin no otoko (1 episode 2015) in post-production; as Self: Tetsuko's Room (1 episode 2015), SciFi Japan TV (1 episode 2013).
Momoko Kôchi (Emiko Yamane; US: Emiko): died in 1998.
Akihiko Hirata (Daisuke Serizawa-hakase; US: Dr. Serizawa): died in 1984.
Takashi Shimura (Kyohei Yamane-hakase; US: Dr. Yamane): died in 1982.
Fuyuki Murakami (Professor Tanabe; US: Dr. Tabata): died in 2007.
Sachio Sakai (Newspaper Reporter Hagiwara; US: Hagiwara): last known acting role in 1991.
Toranosuke Ogawa (President of Company; US same): died in 1967.
Ren Yamamoto (Masaji Sieji; US: Seiji): died in 2003.
Hiroshi Hayashi (Chairman of Diet Committee; US unnamed/uncredited): died in 1971.
Seijirô Onda (Parliamentarian Oyama): last known acting role in 1966.
Tsuruko Mano (Mrs. Sieji; US: The Boy's Mother uncredited): last known acting role in 1974.
Takeo Oikawa (Chief of Emergency Headquarters; US same uncredited): died in 1978.
Toyoaki Suzuki (Shinkichi Sieji; US: Shinkichi): last known acting role in 1956.
Kokuten Kôdô (The Old Fisherman; US: Old Man on Hill on Oto Island uncredited): died in 1960.
Tadashi Okabe (Prof. Tanabe's Assistant; US: Dr. Tabata's Assistant): last known acting role in 1971.
Kin Sugai (Ozawa-san; US unidentified/uncredited): last known acting role in 2010.
Ren Imaizumi (Radio Operator; US same uncredited): last known acting role in 1960.
Junpei Natsuki (Power Substation Engineer): died in 2010.
Katsumi Tezuka (Gojira / Hagiwara's Editor; US Godzilla uncredited): last known acting role in 2001, then 1967 before that.
Haruo Nakajima (Gojira / Power Station Worker; US: Godzilla uncredited): last known acting role in 1973, as Vehicles in 1995; as Self: CBS This Morning (1 episode 2014), SciFi Japan TV (1 episode 2014).
Yasuhisa Tsutsumi (Soldier): last known acting role in 1968.
Jiro Suzuki (Gojira): no other known acting roles.
Saburô Iketani (News Reporter): last known acting role in 1969.
Shizuko Azuma (Woman with Children): last known acting role in 1996.
Shizuko Higashi (Partygoer): died in 1978.
Kiyoshi Kamata (Partygoer’s Escort): no other known acting roles.
Kenji Sahara (Young Lover on the sound; US Man on Boat uncredited): last known acting role in 2011.
Keiji Sakakida (Mayor Inada): last known acting role in 1966; born in 1900 so likely deceased but cannot confirm.
Tamae Sengo (Mother): no other known acting roles.
Ryosaku Takasugi (Gojira; US Godzilla uncredited): other than Americanized version, only other known acting role in 2001.
Ishirô Honda (Power Station Worker (The Hand that Throws the Switch) uncredited): died in 1993.
Godzilla, King of the Monsters! (1956) Unique Cast:
Raymond Burr (Steve Martin): died in 1993.
Frank Iwanaga (Security Officer Tomo Iwanaga): died in 1963
Uncredited 1956 Cast:
Mikel Conrad (George Lawrence): died in 1982.
Paul Frees (Unidentified Character voice): died in 1986.
James Hong (Ogata / Serizawa voice): in Supermansion (1 episode 2015), Agents of S.H.I.E.L.D. (1 episode 2015), Monkey King: Hero Is Back (2015), Tom and Jerry: Spy Quest (2015), The Dog Who Saved Summer (2015), Genghis Khan Conquers the Moon (2015), Beast Mode (2015), Star Wars Rebels (1 episode 2015), Mike Tyson Mysteries (1 episode 2015), Star Wars: The Clone Wars (2 episodes 2015), Teenage Mutant Ninja Turtles (1 episode 2014), Drunk History (1 episode 2014), Diablo III: Reaper of Souls (2014), Kung Fu Panda: Legends of Awesomeness (14 episodes 2013-2014), China, IL (1 episode 2013), Key and Peele (1 episode 2013), Marlow Briggs and the Mask of Death (2013 video game), R.I.P.D. (2013), Summoned (2013), The First Family (1 episode 2013), Blunt Movie (2013), Pair of Kings (3 episodes 2013), The Lost Medallion: The Adventures of Billy Stone (2013), Incredible Crew (1 episode 2013), Mike and Corey in LaLa Land (1 episode 2013); Kung Fu Panda 3 (2016), Patriot Act (2016) in post-production; Untitled James Hong Film (nd; also Producer/Director/Writer) announced; as Producer/Director/Writer/Self: A James Hong Film (2013); as Self: Martial Arts Mania (2015), FX Movie Download (1 episode 2014), Fangasm (1 episode 2013).
Lee Miller (Man in Line at Airport): last known acting role in 1985, as Self in 1993.
Sammee Tong (Dr. Yamane voice): died in 1964.