Infant

is Naraku's heart and seventh detachment; he is not another reincarnation of Onigumo, who was left behind as the lumps of flesh in Mount Hakurei. Despite his appearance, he is capable of speaking fluently. His main power is the ability to control people with the darkness in their own hearts. The Infant is cruel and manipulative, possessing no remorse; he didn't even care that Hakudoshi died.

Story
Upon creation, he was entrusted to Kagura, who left Mount Hakurei just before it collapsed; he appeared to be wrapped in Naraku's baboon pelt. Upon revealing to Kagura that he can speak by informing her that Naraku had succeeded in killing Kikyo, he had her take him to a near by castle for proper clothing; he toke control of the lady of the castle, ordering all travelers be brought to the castle. This was all to capture Kagome, the only person left able to find the jewel shards. He succeeds in her capture, but while searching through her soul, is puzzled by the lack of darkness within it. Luckily, he finds Kagome's jealousy of Inuyasha's feelings for Kikyō, allowing temporary control; Naraku would have a tainted Shikon shard placed in Kagome to make the Infant's control permenant. However, Kagome broke free of his control and was resuced by Inuyasha. The Infant taunted that darkness would still exist in Kagome's heart so long as Inuyasha had feelings for Kikyo. Later, he was forced to nap as fighing to control Kagome's soul toke a lot of his energy.

For this same purpose - to find the Shikon Jewel -, he's taken by Kagura, under Naraku's orders, to temples inhabited by powerful priests. The plan was to kill the priests and read their souls as they departed from this world to the border to the world of the dead. (Naraku had been told by Mimisenri that the Shikon Jewel had been taken to that 'border'). In one such confrontation with a priest, Akago is broken into two just after glimpsing the borderland. Akago's left half was collected by Kanna (who could hide it better thanks to having no demonic energy) while the right half was left in Kagura's care; Akago regrew from his left half while the other half matured into a child version of himself called Hakudoshi.

Naraku had Akago replace the stillborn child of a nobleman, succcessfuly hiding for all enemies. However, Princess Abi attacked the castle in revenge for Naraku causing interference in collecting blood; the Infant was procted by the staff of the castle along with his foster "mother". However, Naraku ordered Kohaku to retrieve him; he did not, but Kanna did. Naraku later gave Akago the Nulling Stone, stolen from Gakusanjin, to mask his demonic aura. Realising that Naraku had made the mistake of giving him the nulling stone, the Infant decided to create a suit of armor himself; he telepathic instructed Hakudoshi to create it for him with the end result being Moryomaru

The Infant attacked Goryomaru's temple, but Moryomaru was sealed by the priest and used as a replacement right arm. Akago and Kanna stayed in the shadows of the temple, waiting for Goryomaru's death. Hakudoshi slew Goryomaru, allowing Moryomaru to consume him from within. The Infant was then placed inside his armor, but Naraku had him captured and placed inside a cell. With Hakudoshi's help, the Infant was able to convicne Kagura to let him out; he revealed Moryomaru's true self to every and ordered Kagura to bring Kohaku's shikon shard to him to increase his power, having alrady taken Kagome's shard.

When his plans failed, the Infant went into hiding, ending Moryomaru's flesh out to find suitable demons to strengthen his "armor", attacking the Snake demons and ressurecting Meioju for his armor and to collect Adamant spears from the Tessaiga Upon completion of Moryomaru's new form, the Infant tried having it absorb Kohaku, only to fail; however, as consolation, his new armor broke Tokijin. When Kanna pretended to switch sides to him, the Infant learned of twin demons that could strenghthen his armor even further, succeeding in having Moryomaru absorb one of them while Tessaiga got the power of the second twin, putting them at a stalemate.

Eventually, the Infant confronts Naraku, hoping to absorb him and the jewel into Moryomaru to make him the most powerful demon ever. He succeeds just as Inuyasha's group arrives to slay Naraku. Gloating over his success, the Infant soon learns that this plan was actauly a rather poior one as Naraku begins counter absorbtion, much to his horror. By Naraku's reappearance, Akago has become a part of his body again.

Abilities

 * Telepathy:  Akago has the ability to communicate with Hakudoshi no matter where he is, to convey his wishes. This seen when Hakudoshi protects Moryomaru in order to get the crystals of demonic energy that would find Nulling stone, thus revealing Akago's location.


 * Manipulation: Akago had the abilityLady_Okugata.png to search deep within a person's heart for darkness and if they didn't have enough willpower to resist him, they would be under his control. Once he is done with someone he has been controlling, they will die; Kagome did not suffer this fate as she accepted her heart's darkness.


 * Barrier Erecting: Akago was able to erect strong barriers (like his master, Naraku) to defend himself. Unlike Hakudōshi, this barrier is controlled by himself and not Naraku which the reason why Naraku has to obtain the power of Yomeiju to penetrated it.

Trivia

 * English-speaking fans often think of Akago as the 'real name' of the character however, the dub only calls "The Infant." However, akago merely means 'baby.' In both versions, his only name is that simple descriptor, similar to Mistress Centipede, whose name is also direct translation.
 * Interestingly, the Infant never speaks again after being split in half, at least until Hakudoshi dies. It is possible only one of them could speak at a time or the second Infant simply prefered to remain silent.