Japanese Legendary Creatures
Most of these come from this list.
Abura-akago
Abura-sumashi
Aka Manto
Akaname
Akashita
Akateko
Akuma
Amabie
Aoandon
Amanojaku
Amazake-babaa
Amefurikozō
Ameonna
Amikiri
Aobōzu
Aonyōbō
Aosaginohi
Ashinagatenaga
Ayakashi
Azukiarai
Bake-kujira
Baku
Basan
Binbōgami
Chimimōryō
Daidarabotchi
Dodomeki
Dragon
Enenra
Funayūrei
Furaribi
Fūri
Futakuchi-onna
Gagoze
Gashadokuro
Goryō
Hanako-san
Harionago
Hibagon
Hiderigami
Hito-gitsune
Hitotsume-kozō
Hitotsume-nyūdō
Hone-onna
Hyōsube
Ikiryō
Ikuchi
Inugami
Ishinagenjo
Isonade
Iso-onna
Janjanbi
Jinmenju
Jorōgumo
Jubokko
Kaibyō
Kamaitachi
Kamikiri
Kappa
Kasa-obake
Kage-Onna
Kerakera-Onna
Kasha
Kawauso
Keukegen
Kijimuna
Kinoko
Kirin
Kitsune
Kitsunebi
Kodama
Komainu
Konaki-jiji
Korpokkur
Koromodako
Kotobuki
Kuchisake-onna
Kuda-gitsune
Kudan
Kyubi
Mikaribaba
Mikoshi-nyūdō
Misaki
Mizuchi
Mokumokuren
Mononoke
Mōryō
Mujina
Momiji
Namahage
Namazu
Ningyo
Noderabō
Noppera-bō
Nue
Nuppeppō
Nurarihyon
Nure-onna
Nurikabe
Nyūdō-bōzu
Obake
Oboroguruma
Oiwa
Okiku
Ōmukade
Oni
Onibi
Onikuma
Onryō
Ōnyūdō
Osaki
Otoroshi
Ouni
Okubi
Ohaguro-Bettari
Raijū
Rokurokubi
Samebito
Sankai
Satori
Sazae-oni
Shachihoko
Shidaidaka
Shikigami
Shinigami
Shiranui
Shirime
Shiryō
Shōjō
Shōkera
Sōjōbō
Sunekosuri
Takaonna
Tanuki
Ten
Tengu
Tennin
Tenome
Tesso
Tōfu-kozō
Tsuchigumo
Tsuchinoko
Tsukumogami
Tsurubebi
Tsurara-onna
Tsurube-otoshi
Ubagabi
Ubume
Umi zatō
Umibōzu
Ushi-oni
Uwan
Waira
Wanyūdō
Yamabiko
Yamawaro
Yamajijii
Yama-uba
Yanari
Yobuko
Yōkai
Yōsei
Yosuzume
Yuki-onna
Yume no seirei
Yūrei
Zashiki-warashi