Watatsumi

 More Dragons! but a Japanese sea dragon this time
Another old image done for a TCG game.

LET´S WIKIATTACK!!!
 

Watatsumi (海神, 綿津見) also pronounced Wadatsumi, is a legendary kami (神, god) Japanese dragon and tutelary water deity in Japanese mythology. Ōwatatsumi no kami (大綿津見神, "great deity of the sea") is believed to be another name for the sea deity Ryūjin (龍神, Dragon God), and also for the Watatsumi Sanjin (綿津見三神, "Three Watatsumi gods"), which rule the upper, middle, and lower seas respectively and were created when Izanagi was washing himself after returning from Yomi, "the underworld".

The Kojiki version of the Japanese creation myth honorifically refers to Watatsumi 海神 with the name Ōwatatsumi kami 大綿津見神 "Great Watatsumi god". A subsequent Kojiki passage describes Watatsumi's daughter Otohime and her human husband Hoori living with the sea god. After Hoori lost his brother Hoderi's fishhook, he went searching to the bottom of the sea, where he met and married the dragon goddess Otohime. They lived in the sea god's underwater palace Ryūgū-jō for three years before Hoori became homesick.  So he dwelt in that land for three years. Hereupon His Augustness Fire-Subside thought of what had gone before, and heaved one deep sigh. So Her Augustness Luxuriant-Jewel-Princess, hearing the sigh, informed her father, saying: "Though he has dwelt three years [with us], he had never sighed; but this night he heaved one deep sigh. What may be the cause of it?" The Great Deity her father asked his son-in-law saying: "This morning I heard my daughter speak, saying: 'Though he has dwelt three years [with us], he had never sighed; but this night he heaved one deep sigh.' What may the cause be? Moreover what was the cause of thy coming here?" Then [His Augustness Fire-Subside] told the Great Deity exactly how his elder brother had pressed him for the lost fish-hook. Thereupon the Sea-Deity summoned together all the fishes of the sea, great and small, and asked them, saying: "Is there perchance any fish that has taken this fish-hook?" So all the fishes replied: "Lately the tahi has complained of something sticking in its throat preventing it from eating; so it doubtless has taken [the hook]." On the throat of the tahi being thereupon examined, there was the fish-hook [in it]. Being forthwith taken, it was washed and respectfully presented to His Augustness Fire-Subside, whom the Deity Great-Ocean-Possessor then instructed. Watatsumi instructs Hoori how to deal with Hoderi, and chooses another mythic Japanese dragon, a wani "crocodile" or "shark", to transport his daughter and son in law back to land.

The genealogy of Emperor Jimmu claims descent from the goddess Toyotama-hime, the daughter of Hori and Otohime, who is identified as the daughter of Watatsumi (海童)
"The Emperor Kami Yamato Ihare-biko's personal name was Hiko-hoho-demi. He was the fourth child of Hiko-nagisa-takeu-gaya-fuki-ahezu no Mikoto. His mother's name was Tamayori-hime, daughter of the Sea-God. From his birth, this Emperor was of clear intelligence and resolute will"