
Ryu
The Sea Dragon of Japanese Myth
The Japanese ryu evolved from Chinese dragon mythology blended with native Japanese beliefs. With three toes (the fewest among East Asian dragons), the most famous ryu is Yamata-no-Orochi, the eight-headed serpent slain by the god Susanoo, from whose tail the sacred sword Kusanagi was found. Ryujin, the dragon-god of the sea, rules from the underwater Ryugu-jo palace. Featured prominently in temple ceiling paintings, ukiyo-e prints, and samurai family crests.
Related

Long
The Imperial Dragon of Chinese Myth

Imugi
The Aspiring Dragon

Yong
The Divine Dragon of Korean Myth

Azure Dragon
靑龍 · Eastern Guardian of the Four Symbols

Yamata-no-Orochi
八岐大蛇 · Eight-Headed Serpent of Japanese Myth

Tiamat
Primordial Sea Dragon of Mesopotamian Myth

Vritra
Indian Vedic Drought Dragon

Bahamut
Arabian Cosmic Fish + D&D Platinum Dragon of Justice

Fafnir
Cursed Treasure Dragon of Norse Myth

Apophis
Egyptian Cosmic Serpent of Darkness and Chaos

Blue Dragon
Lightning Lord of the Desert

Lernaean Hydra
Nine-Headed Marsh Monster