Yoruyama

Yoruyama, was a Dark Dragon, the King of the Dark Dragons, as well the foster father of Natsu Dragyama, before his death by Acnologia.

Apperance
Yoruyama was a gigantic, serpentine-like dragon with red eyes, a white, spiky mane which went onto his back, black scales on most of his body, while having white scales under his stomach, large talon, large fangs, black whiskers, large black wings and large deer horns on his head.

Personality
Despite being a Dark Dragon, Yoruyama was a kind, benevolent and caring dragon, who taught, raised and protected Natsu. He often cursed himself and his Darkness-based power, believing it caused nothing but misery, pain and sorrow.

Another example of his kindness was that he protected Natsu from Acnologia in his last moments, which cost him his life. After being killed by Acnologia, Yoruyama gave his final words of wisdom to Natsu.

Trivia

 * “Yoru” means Night in Japanese, while “Yama” mean “Mountain” in Japanese as well. Together, “Yoruyama” means “Night Mountain.”