The Heart of the Dragon (Demon)

The Heart of the Dragon is an ancient Japanese Demon which borned from spirit of Yoshio Nakadai, a fearless ronin which once lived in Japan. Unlike other demons which borned after intense soul-ripping torture in Hell, he borned due to Demon magical interference via a  spell.

Physical Appearance
Unlike other demons which appear like black smoke forms, he appear as fierce vortex of fire. However, he has black eyes which showed soon after he possessing a vessel.

Personality
Due to being born from a spirit of fearless ronin, He was very fearless, in addition of some twists: sadistic, ruthless, brutal, and violent. He also

Background
In 1859, Yoshio Nakadai, a ronin, caught by angry mob due to being suspected committing various atrocities, including "violating" a woman (thanks to Demons efforts to framed him). He later executed by burning alive to death. However, it was revealed, all of this just a Demon plot to convert his soul to a "weapon of unimaginable power" in the hands of demonkind.

In 1969, a descendant of Yoshio Nakadai, Albert Chao (a Chinese-Japanese descent) invoking him, but later banished by hunter Samuel Campbell and Jack Bartow, with cost of latter life. In 1989, it came back again, and faced by John Winchester, but it able to escape again.

In 2009, Albert Chao later re-summoned him with assist of witch Moondoggy Verlander with powerful Demon Summoning spell. Unleashing him again to wreak havoc once more. But in this time, Sam and Dean able to dispatch him. Sam later administered a spell, releasing his spririt so he could be moved on, with addition sending back its demonic essence to Hell.

Powers and Abilities
The Heart of the Dragon is quite powerful Demon, with some of his abilities somehow shared with the canon counterpart Knight of Hell.
 * Possession - To walk on earth, he must possessed a vessel before. However, unlike other demons, there are pre-requirement to a people which wanted to served as his vessel, the vessel must carried Yoshio Nakadai bloodline.
 * Pyrokinesis - He able to control fire to a masterful degree. By invoking him, the invoker able to summoned him and his powers to control fire.
 * Apporting - He able to summon his weapon, a flaming demonic katana with ability to summon and control fire, to him.
 * Immunity - He is immune to exorcism, a trait that somehow shared by Knight of Hell. However, a Devil Trap still able to put effect on him, although it's not long.
 * Telekinesis - He able telekinetically break neck of hunters that inteded to trap and banshed him for once more easily.
 * Healing - He able to heal any damages on his vessel, although severe damages cannot easily healed in-time and need some time.
 * Power Granting - When possessing people, he able to grant various attribute to its vessel. Making him and its vessel nearly invincible.

Weaknesses
Despite its status, The Heart of the Dragon still have some weaknesses. Although all of them are unique.
 *  Devil Trap - A Devil Trap still able to put effect on him, although it's not long enough.
 * Doragon Kokoro - An enchanted katana once possessed by Yoshio Nakadai. The only thing that able to harm and kill him.
 * Soul Binding Releasing Spell - This spell able to release his spirit from demonic binding. After its administration, the spirit will reverted back into its real form, and send back its demonic essence to Hell, make it unable again to re-summoned forever.

Appearance

 * Supernatural: Heart of the Dragon