Rōyakan

is a wolf demon of hell, who is a gentle guardian of forest.

During the story
One day, Naraku put a jewel shard on his forehead, and made him attack Inuyasha, who had been injured. He failed, but was freed from the jewel shard's power with Kagome's help. However, Naraku came upon Rōyakan once again and forcibly embedded another shard of the Shikon Jewel into Rōyakan's body, against the wolf demon's will. Rōyakan underwent another transformation, with his head closer resembling that of an ordinary wolf, he also grew in size, and his power also massively increased because of the second Shikon Jewel shard. Inuyasha struggled against the newly empowered Rōyakan, and looked as though he would be defeated, until Kagome returned to the Feudal Era, prompting Inuyasha to run to her side. Rōyakan was eventually defeated when Inuyasha smashed him in the face and mouth with a tree that he had uprooted. Shortly after the battle Rōyakan begged for help as Kagome removed the two jewel shards from his head given to him by Naraku, then returned to normal, thanked Kagome for her help and ran back to the forest.

Rōyakan returned when the panther tribe came back. He wanted to help Sesshōmaru, but was denied. It was revealed that 50 years ago when the panther tribe attacked, Rōyakan was in debt to Sesshōmaru's father, who had killed the leader of the panther tribe. He fought the best he could along with other demons that the Great Dog Demon had saved, but they were forced to retreat.

Personality
Rōyakan appears to be a kind, almost timid, demon while not under the Shikon Jewel and Naraku's influence; he cowered in fear when Naraku found him again and forced another shard of the jewel into his body. Kaede mentioned that Rōyakan was a gentle guardian of the forest, further supporting his overall kind nature.

While under the jewel's influence, Rōyakan becomes much more ferocious, bloodthirsty and dangerous. He fiercely attacked Inuyasha on two occasions, almost killing him the second time.

Physical description
Rōyakan has the appearance of a massive wolf demon, with a strangely rounded head. Without the influence of the jewel shard his eyes are, wide, expressive, and blue.

When he is under the influence of the Shikon Jewel, his eyes bulge out of his head, and he gains massive red pupils, with drool hanging from his mouth. Upon being given the second jewel shard, Rōyakan's appearance changes even more drastically, he grows to a massive size, over twice the size of his original appearance; his eyes become completely red as well. His head and face also resemble that of an ordinary wolf, more so than ever before. His legs and arms also grow to a massive size, proportionate to his new body.

Powers & Abilities
Rōyakan's most notable power was the ability to spit an infinite number of three-eyed wolves out of his mouth. When no longer needed or if Rōyakan becomes unconscious, the wolves disappear as smoke.

Manga vs. Anime

 * In the manga, after Rōyakan's first attack against Inuyasha failed, Naraku appeared before him and implanted a rice seed on him with a shard of the Shikon jewel. This caused great pain for Rōyakan. Naraku promised to remove the seed from Rōyakan if he killed Inuyasha. In the anime, Naraku had already used a jewel shard on Rōyakan before his first attack against Inuyasha. After the attack failed, Naraku used another shard on Rōyakan that drastically changed his appearance and personality.
 * In the manga, Naraku explained to Rōyakan that the reason that he would not attack Inuyasha himself because he was in the middle of a transformation which made him vulnerable. This was not stated in the anime.
 * In the manga, it is shown what happens to Rōyakan after Inuyasha's first confrontation with Naraku. Inuyasha and his friends hear Rōyakan screaming in pain. Kagome sees a Shikon jewel shard on his forehead. As Kagome attempts to take it, Rōyakan states that only Naraku can touch it. Kagome, however, is able to remove it from Rōyakan, and return him to his original self. Rōyakan apologizes for all the trouble he caused and leaves. Inuyasha is about to pursue him before Miroku convinces him that it was Naraku who forced him to attack them. This is not shown in the anime.

Media appearances
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Manga

 * Chapter 66
 * Chapter 67
 * Chapter 68
 * Chapter 69
 * Chapter 70
 * Chapter 72

Anime
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 * Episode 20
 * Episode 21
 * Episode 40
 * Episode 75
 * Episode 76
 * Episode 77