Ryuujin

Ryuujin (Dragon God in most media) is the original wielder of the Ryuujin orb and also serves as a keeper of the orb within the depths of Mount Fuji. He is a supporting character of the series and throughout the Kaguya arc.

Appearance
In ancient times when the country of Japan is known as the Fire Country during the time Kaguya had first invaded Earth, Ryuujin appears to have a long black hair tied in a traditional bun adorned in a red laced ribbon and was covered in a black turban and blue eyes.

When he gave the Ryuujin orb to Kaguya and before transforming into his original form, he wears a robe worn by imperial priests under the leadership of the Japanese Emperor; a long light teal robe with a teal ribbon tied around his waist, a purple long sleeved kimono shirt beneath his robes, white hakama and he was barefeet.

In his original form, he wears a genji-type of armor worn by samurais; a light red long traditional vest with a light violet and white modified genji armor along with a black and indigo long sleeved garb. He has matching greaves within his genji armor, black pants and modified boots resembling a matching tabi and a white geta. His black and purple genji helmet is covering his blue eyes and has long white ragged hair in each sides with laces being tied into his chin and the emblem of his helmet was adorned in a golden crescent moon shape.

In the present day, he became an elderly in appearance with light gray hair and pale skin due to his age and he grew a light gray ragged mustache in each sides which is similar to Hangetsu and he glows in a bright green aura that resembles a green dragon flame. He retains wearing his original outfit on his youth.

Summary
Prior to the anime series' run, the original Ryuujin is one of the imperial priests under the leadership of the Emperor during the feudal era in Japan formerly known as the Fire Country since ancient times. He first appears to stop Kaguya from attempting to hurt the Emperor with her energy blasts and gave the Ryuujin Orb to her. Once she gets the orb it was resonating within her and he tells her to give up on conquering the Earth and return to the Moon. Kaguya angrily replies that she is not given up and she threw the orb back into him. Ryuujin also reveals that the Ryuujin Orb is an evil conquering Orb causing him to transform into his original form while engulfing into a green dragon hue and this cause a fight between him and Kaguya in an ensuing but a chaotic battle.

Ryuujin also knows Kaguya's true nature when she fuses with someone else while hiding her true form beneath it. He tells Kaguya about her mistake of fusing with the human Earthling which is the original Dragon maiden, the daughter of the Dragon King. Kaguya refused to believe him stating it was foolish. Despite her attempts to get herself separated, Ryuujin would cut off her rabbit ears as it means to seal her away and in order to release her true form is to find the descendant of the Dragon maiden in a thousand years while taunting her if she could survive that long. He succeeds in cutting off Kaguya's rabbit ears, causing her to suffer great pain in defeat, leading her to be put into a slumber over a thousand years.

In the present day which is a thousand years later, the Ryuujin currently resides at the depths of Mount Fuji where he currently keeps the Ryuujin orb. His voice was initially heard who tested Yaiba and his group while trying to get the Ryuujin orb within the depths of Mount Fuji as he gave them a candle that burns in a green flame. Yaiba manages to overcome the deadly traps made by him and at the same time letting his friends to fall into the edge one by one which Yaiba believes they were killed by falling into the edge below. It was later revealed that Yaiba's friends were safe as they were held inside the cage after falling into the edge which it has lava beneath the ground. The Ryuujin finally faces Yaiba who is willing to give him the Ryuujin orb to inherit his Ryuujin powers which Yaiba did and his Raijin Sword transforms into the Ryuujin Sword. He physically appears on Kaguya's flashbacks and being mentioned by Kaguya herself and always mistook Yaiba as him.

He reappears in the near end of the anime, where Yaiba manages to use the Ryuujin powers in battling against Kaguya's true form as well as he stated that the powers of the Ryuujin orb is used to destroy planets, much to her horrible shock and to Yaiba's horror knowing that he's gonna kill his friends and the inhabitants on Earth. After Yaiba defeated Kaguya using the Ryuujin powers, Ryuujin informs Musashi and the others that Kaguya has been put into a slumber for another thousand years after she uses her energy to protect the inhabitants on Earth because of her deep loved of the planet and it was Yaiba who saved everyone from getting killed. With that, the Ryuujin leaves along with his Ryuujin orb.