Suikotsu

was a member of the Shichinintai. Like the others, he loved carnage and killing; however, unlike them, he had a split personality. This personality was that of a kind-hearted doctor, who may have been the original personality until a traumatic event caused the birth of his other, more bloodthirsty, personality.

History
Fifteen years before the series began, the Shichinintai took a job for a lord. They were soon betrayed by the lord due to the Shichinintai being considered too dangerous to exist. They fled into the mountains, but they were soon captured and executed. Suikotsu and the other Shichinintai members would then be revived when Naraku would give the leader Bankotsu seven Sacred Jewel shards.

During the story
Suikotsu was looking after orphans near Mount Hakurei. He was met by the priestess Kikyō. She could sense the jewel shard in his neck, but was puzzled by it because it was not corrupt. They were then approached by the Renkotsu, Jakotsu, and Ginkotsu. They came to pick up Suikotsu, but he did not remember them. Inuyasha and his friends then arrived to where the Shichinintai were. During the fight, Suikotsu became injured. This sight of his own blood caused him to have a psychotic break. His evil persona awoke, and he joined up with the other members of the Shichinintai. They soon joined up with Bankotsu. They attacked the castle of the lord that betrayed them. After they destroyed the castle, they were approached by Kōga. Inuyasha's group arrived shortly thereafter. Suikotsu fought against Miroku; professing his hatred towards monks and doctors. The Shichinintai made a retreat after ordered to by Naraku's saimyōshō. They met up with Kanna and Kohaku, and were given new orders to kill Sesshōmaru with the rest of Naraku's enemies. Bankotsu ordered Suikotsu and Jakotsu to kill Sesshōmaru.

Death
Suikotsu died after a battle with Kikyō and Sesshōmaru, the latter of which decided to fight him after he kidnapped and threatened to kill Rin. After suffering a fatal attack, he asks Kikyō to remove his jewel shard from his neck so that he can die peacefully. Sadly, Jakotsu violently removes the shard instead. Suikotsu claims it is alright however as he is still allowed to die.

Personality
Suikotsu suffers from multiple personality disorder. He has two, definite split personalities. One a gentle, philanthropist doctor who looks after orphans, the other a psychopathic and sadistic thrill killer with a Wolverine-like appearance that earns him his spot in the Band of Seven. When his evil side takes hold, he seems to possess a dry sense of humor and an insatiable desire for blood, while when his good side is in control, he often hallucinates that he has blood on his hands.

Physical description
Suikotsu appears as a tall young man with brown hair and pale skin. While Dr. Suikotsu is in control, he has his hair tied back in a ponytail and wears a traditional haori of a common villager.

Suikotsu's true appearance is very different from his good half, his facial expressions are described as being quite similar to that of a yōkai.

Powers & Abilities
When he is good, Suikotsu is a skilled healer who can make several remedies with various herbs for various injuries. He is often compared to a saint.

While his evil self is out, he has athletic attributes that rival those of Bankotsu, and strength that rivals Inuyasha. He wields a pair of Tiger-Claws. He also claims to be an expert of close-range combat.

Manga vs. Anime

 * In the anime, the circumstances surrounding Suikotsu's multiple personalities were revealed. Suikotsu started out as a doctor, but seeing so much death and bloodshed due to war began to affect him psychologically. He finally snapped when he killed a soldier out of self-defense. Knowing that killed someone caused him to develop a new persona that enjoyed killing others.

Trivia

 * Suikotsu's name comes from two kanji (睡, "Sui"; 骨, "Kotsu"), and is translated as "sleeping skill," possibly referring to his "sleeping" personality.
 * Suikotsu's Theme-Music from the InuYasha Official Soundtrack, Vol. 3 is entitled "The Two-Faced Suikotsu".
 * Suikotsu's characteristic resembles that in Dr. Jekyll and Mr. Hyde, as the good half is a doctor while the evil half is a mad killer.
 * His eyebrows also disappear when his evil personality surfaces.
 * The evil Suikotsu's "claws" and hairstyle look similar to Wolverine's from . He has even copied some of his more well-known poses, such as crossing his arms over his chest or spreading his arms apart.
 * The blades of his tiger-claws have constantly changed their size, from being the length of the glove/handle, to being three times as long. The angle of the blades are also inconsistent.

Media appearances
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Manga

 * Chapter 245
 * Chapter 246
 * Chapter 247
 * Chapter 248
 * Chapter 249
 * Chapter 250
 * Chapter 251
 * Chapter 252
 * Chapter 253
 * Chapter 254
 * Chapter 258
 * Chapter 259
 * Chapter 260
 * Chapter 261
 * Chapter 262
 * Chapter 263
 * Chapter 265
 * Chapter 276

Anime
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 * Episode 103
 * Episode 107
 * Episode 108
 * Episode 109
 * Episode 110
 * Episode 111
 * Episode 114
 * Episode 115
 * Episode 116
 * Episode 120
 * Episode 121
 * Episode 122
 * Episode 123