Tsuyoshikō

Tsuyoshikō (剛コウ) is a top-tiered dragon that serves as one of the four members of the Shiryū (四竜, Four Dragon Kings). He was later killed by and assimilated into Yūmei Kokūzō.

Appearance
Tsuyoshikō's scales and wings adopt the appearance of obsidian, like the other Shiryū. His main element being fire, his body is lit up like a furnace. In spite of this, rain has no effect on his bodily structure.

Abilities
As a top-tiered dragon, Tsuyoshikō possesses a cataclysmic reservoir of chakra. He is a master of Fire Release, indicative by the very derived element constantly flowing throughout the coursework of his body as if it were blood; his techniques relied on the production of orange and white flames, their respective temperatures easily ranging in-between 1,100 °C and 1,500 °C. The flames that course throughout his body are so hot, that even the most heaviest of downpours cannot affect him, near-instantaneously evaporating before coming within even a few feet of his scales.