Japanese actors' status
For a very through list, please see amamiyarin 's post: here.
In fact, please check there, her list is already much larger than the one I started here, so I'll just give her any names I find.
For those wondering, you can check here for a (thankfully sizeable) list of known japanese idols confirmed to be okay.
Agito
Kaname Jun
Akiyama Rina
Kotani Yoshikazu
Kashuu Toshiki
Ryuki
Odai Ryohei
Kato Natsuki
Takano Hassei
Hagino Takashi
Yuge Tomohisa
Matsuda Satoshi
555
Fujita Ray
Haga Yuria
Izumi Masayuki
Karahashi Mitsuru
Blade
Tsubaki Takayuki
Morimoto Ryoji
Takahiro Hojo
Takezai Terunosuke
Hibiki
Matsuda Kenji
Tochihara Rakuto
Shibue Joji
Kabuto
Mizushima Hiro
Sato Yuki
Kato Kazuki
Tokuyama Hidenori
Uchiyama Masato
Nagata Anna
Yuge Tomohisa
Den-O
Sato Takeru
Nakamura Yuichi
Akiyama Rina
Sakurada Doori
Furukawa Yuuta
Kiva
Seto Kouji
Takigawa Eiji
Ogoe Yuki
Haga Yuria
Kato Keisuke
Matsuda Kenji
Takeda Kouhei
Yamamoto Shouma
Decade
Inoue Masahiro
Mori Kanna
Murai Ryota
Totani Kimito
Suzuki Hiroki (Junes)
Double
Kiriyama Renn
Suda Masaki
Kimisawa Yuki
Kinomoto Minehiro
Yamamoto Hikaru
Itano Tomomi
Kasai Tomomi
OOO
Miura Kyosuke
Watanabe Shu
Hiroaki Iwanaga
Takada Riho - says cast of OOO is all right
Kimijima Asaya
Gokaiger
Ozawa Ryota - said whole cast is fine
Yamada Yuki - hasn't posted but Ryota said whole cast
Ichimichi Mao
Shimizu Kazuki - hasn't posted but Ryota said whole cast
Koike Yui
Shinkenger
Matsuzaka Tori
Aiba Hiroki
Suzuki Shogo
Morita Suzuka
Takanashi Rin
Sohma Keisuke
Karahashi Mitsuru
Go-Onger
Tokuyama Hidenori
Ebisawa Kenji
Sugimoto Yumi
Kataoka Shinwa
Furuhara Yasuhisa
Goseiger
Hamao Kyousuke
Chiba Yudai
Satou Rika
Niwa Mikiho
Boukenger
Saito Yasuka
Gekiranger
Suzuki Hiroki (D-Boys)
Araki Hirofumi
Abaranger
Tomita Sho
Gaoranger
Shibaki Takeru
Sakai Kazuyoshi
Ultraman Mebius
Igarashi Shunji
Watanabe Daisuke
Garo
Konishi Ryosei
Fujita Ray
Yamamoto Shouma
Others
Kawai Ryunosuke
Shindo Gaku
Kitamura Eiki
Washimi Ryo
Sakamoto Naoya and Kazuya
D-Boys - reportedly all okay
Edited at 10:30 pm EST, 3/16
In fact, please check there, her list is already much larger than the one I started here, so I'll just give her any names I find.
For those wondering, you can check here for a (thankfully sizeable) list of known japanese idols confirmed to be okay.
Agito
Kaname Jun
Akiyama Rina
Kotani Yoshikazu
Kashuu Toshiki
Ryuki
Odai Ryohei
Kato Natsuki
Takano Hassei
Hagino Takashi
Yuge Tomohisa
Matsuda Satoshi
555
Fujita Ray
Haga Yuria
Izumi Masayuki
Karahashi Mitsuru
Blade
Tsubaki Takayuki
Morimoto Ryoji
Takahiro Hojo
Takezai Terunosuke
Hibiki
Matsuda Kenji
Tochihara Rakuto
Shibue Joji
Kabuto
Mizushima Hiro
Sato Yuki
Kato Kazuki
Tokuyama Hidenori
Uchiyama Masato
Nagata Anna
Yuge Tomohisa
Den-O
Sato Takeru
Nakamura Yuichi
Akiyama Rina
Sakurada Doori
Furukawa Yuuta
Kiva
Seto Kouji
Takigawa Eiji
Ogoe Yuki
Haga Yuria
Kato Keisuke
Matsuda Kenji
Takeda Kouhei
Yamamoto Shouma
Decade
Inoue Masahiro
Mori Kanna
Murai Ryota
Totani Kimito
Suzuki Hiroki (Junes)
Double
Kiriyama Renn
Suda Masaki
Kimisawa Yuki
Kinomoto Minehiro
Yamamoto Hikaru
Itano Tomomi
Kasai Tomomi
OOO
Miura Kyosuke
Watanabe Shu
Hiroaki Iwanaga
Takada Riho - says cast of OOO is all right
Kimijima Asaya
Gokaiger
Ozawa Ryota - said whole cast is fine
Yamada Yuki - hasn't posted but Ryota said whole cast
Ichimichi Mao
Shimizu Kazuki - hasn't posted but Ryota said whole cast
Koike Yui
Shinkenger
Matsuzaka Tori
Aiba Hiroki
Suzuki Shogo
Morita Suzuka
Takanashi Rin
Sohma Keisuke
Karahashi Mitsuru
Go-Onger
Tokuyama Hidenori
Ebisawa Kenji
Sugimoto Yumi
Kataoka Shinwa
Furuhara Yasuhisa
Goseiger
Hamao Kyousuke
Chiba Yudai
Satou Rika
Niwa Mikiho
Boukenger
Saito Yasuka
Gekiranger
Suzuki Hiroki (D-Boys)
Araki Hirofumi
Abaranger
Tomita Sho
Gaoranger
Shibaki Takeru
Sakai Kazuyoshi
Ultraman Mebius
Igarashi Shunji
Watanabe Daisuke
Garo
Konishi Ryosei
Fujita Ray
Yamamoto Shouma
Others
Kawai Ryunosuke
Shindo Gaku
Kitamura Eiki
Washimi Ryo
Sakamoto Naoya and Kazuya
D-Boys - reportedly all okay
Edited at 10:30 pm EST, 3/16