Biodata
| Feature | Details |
|---|---|
| Name | Bai Ye (白夜) 23 25 |
| Alias(es) | Kaguya Byakuya; Kaguya Shuo Ya (a name assigned to him by the laboratory) 21 22 25 |
| Species/Race | Human; Kaguya clan 21 |
| Gender | Male 21 |
| Occupation/Role | Former escaped experimental subject; Shikotsumyaku user; guardian of the Senju Clan Grounds 21 45 50 |
| Status | Alive; resides at the Senju Clan Grounds as Chiba's ally while his Cursed Seal remains suppressed and concealed 26 81 87 |
| First Appearance | Chapter 21 (as Kaguya Shuo Ya) |
Power Progression
| Stage | Advancement | Details |
|---|---|---|
| Laboratory survivor | Shikotsumyaku and parasitic chakra implantation | Escaped with the Kaguya clan's bone-manipulation kekkei genkai, but carried a black parasitic chakra/Cursed Seal implanted in his bones by the laboratory. 21 24 |
| Northeastern forest battle | Incomplete Bracken Dance | Extracted and reshaped his spine into a branching bone spear, using an incomplete form of Bracken Dance to corner Chiba. 23 |
| Senju Clan Grounds training | Soft Bone control | Demonstrated the ability to alter his bone density and elasticity, allowing bones to bend around defenses before instantly hardening to pierce or bind targets. 34 |
| Clan guardian period | Defensive and tactical application | Incorporated Soft Bone into layered perimeter defenses and trained against Chiba's traps, learning to account for retreat routes and survival after failed attacks. 34 45 |
| Underground Sage training | Sustained high-intensity sparring | Pressed Chiba during Half-Sage Mode training with bone forests, bone spears, blades, and a spine whip, serving as one of the clan's principal combat fail-safes. 84 87 |
Background / History
Bai Ye escaped an experimental laboratory and fled into the northeastern forest outside Konoha. His body bore pursuit wounds, repeated needle marks from blood extraction and drug injections, and a traumatic distrust of anyone seeking his blood. When Senju Chiba located him for a Shikotsumyaku cell sample, Bai Ye immediately assumed Chiba wanted to capture and exploit him like the laboratory personnel had. 21
He initially identified himself as Kaguya Shuo Ya, but later revealed that Shuo Ya was merely the name written on his laboratory tank. During his battle with Chiba, he declared himself Kaguya Byakuya. 21 22 His actual name, given by his clan, is Bai Ye. 25
Bai Ye fought Chiba through the night, using bone armor and repeated bone growth to neutralize Chiba's toxins and cut apart his root network. He pushed Chiba to the edge of a cliff and attempted to finish him with an incomplete Bracken Dance-derived bone spear formed from his own spine. 22 23
Chiba's emergency evolution, Wood Release: Skeletal Reinforcement, allowed his vines to develop internal bone-like supports that could pierce Bai Ye's armor and carry poison into his chakra system. Facing paralysis and compromised armor, Bai Ye revealed the black parasitic chakra implanted in his bones by the laboratory. By allowing Chiba's evolved vines to absorb his bone matter, he caused the contamination to enter Chiba's new bone-wood framework. 24
Chiba subsequently turned the contaminated Bone Wood connection against Bai Ye, sending paralytic poison through the Cursed Seal and immobilizing him. After defeating him, Chiba refused to immediately extract a living Shikotsumyaku sample, instead offering Bai Ye the choice to leave or remain at the Senju Clan Grounds. 25
Bai Ye revealed that he was the last Kaguya survivor and that the people hunting him came from a mountain laboratory in the Land of Rice Fields associated with Hidden Sound Village. After recovering for three days at the Senju Clan Grounds, he agreed to help Chiba revive the Senju in exchange for shelter, protection, and assistance against his pursuers. He retained his name and refused to kneel, conditions Chiba accepted. 25 26
Chiba concealed Bai Ye's Cursed Seal beneath an insulating layer of Bone Wood, preventing the mark's chakra from leaking and obstructing the laboratory's tracking. The seal itself remained active beneath Bai Ye's collarbone. 26
As his recovery progressed, Bai Ye repaired the dilapidated Senju Clan Grounds, strengthened its perimeter with layered bone traps, and became its principal guardian while Chiba undertook missions. He helped raise the restored Senju flag and pledged that no one would enter the grounds without Chiba's command. 34 45 50
After Chiba brought Haku to the clan grounds, Bai Ye initially tested the former Hidden Mist assassin at bone-blade point. He ultimately accepted Chiba's decision and formally addressed him as “clan head,” joining Haku and Chiba beneath the restored Senju crest. 81
Appearance
Bai Ye is a pale, ash-white-haired boy whose Shikotsumyaku allows bones to erupt from and reshape his body during combat. He was already visibly injured when Chiba encountered him in the forest. 21 81
- Fresh blade wounds and clustered needle scars beneath his ribs from laboratory experimentation. 21
- Can pull long, serrated bone weapons directly from his own body. 21 22
- Forms layered white bone armor across his chest, limbs, and joints. 22
- Bears a black mark beneath his collarbone connected to the parasitic chakra implanted in his bones. 24
- Usually conceals the Cursed Seal beneath an insulating wooden layer fused under his collarbone. 26 36
- Commonly wields a bone sword formed from his right arm. 50 59
Personality
Bai Ye is fiercely survival-driven and immediately hostile toward people who show interest in his blood or body. His experience as a laboratory subject has left him convinced that promises of kindness are meaningless, and he responds to perceived exploitation with lethal force. 21
In battle, he is observant, relentless, and willing to damage his own body for an advantage. He recognizes Chiba's dependence on underground water, targets the root system supplying it, and continues forcing bone growth despite blood loss and deteriorating bone density. 22 23
Despite his aggression, he acknowledges opponents who demonstrate real strength. His exchanges with Chiba develop into a brutal contest of adaptation, with both combatants openly assessing the other's limits. 22 23
After joining Chiba, Bai Ye remains blunt, distrustful, and quick to suggest lethal solutions to perceived threats. However, he increasingly directs those instincts toward protecting the Senju Clan Grounds, its flag, and Chiba's secrets. 30 45 50 51
He initially favors direct charges and immediate kills, reflecting the Kaguya clan's destructive culture. Through sparring with Chiba, he has begun learning patience, trap awareness, tactical retreat, and the importance of surviving after an attack fails. 34
Bai Ye values agency because it was denied to him in the laboratory. Chiba's willingness to offer him a genuine choice becomes the basis of his cautious loyalty to the Senju Clan Grounds. 25 26 81
Abilities & Skills
Shikotsumyaku
Bai Ye possesses the Kaguya clan's bone-manipulation kekkei genkai, allowing him to grow, shape, detach, and control bone structures using chakra. 21 22
- Generates bone spikes, blades, swords, and armor from his shoulders, ribs, elbows, knees, and other parts of his body. 21 22
- Creates a serrated bone sword by pulling a full bone from his shoulder blade. 21
- Grows bone spikes from detached fragments and uses them to attack through the ground. 22 23
- Retains residual chakra in severed bones, allowing them to continue growing after separation from his body. 22
- Rapidly regrows bones after removing or breaking them. 22 24
- Can create bone forests, ground-launched spears, paired arm blades, and spine-whip weapons during sparring. 34 87
- Excessive bone production causes blood loss, worsens existing wounds, and reduces the density of newly formed bone. 22 23
Soft Bone Control
Bai Ye can actively alter the elasticity and density of his bones, a high-level application of Shikotsumyaku that exceeds the capabilities recorded in Chiba's acquired samples. 34
- Can soften bones enough to bend around restraints, defenses, and underground obstacles. 34
- Can instantly restore softened bones to high density, enabling them to pierce stone or strike with hardened edges after bypassing an opponent's guard. 34
- Can maintain different properties along the same bone structure, such as a flexible tail and hardened tip. 34
- Uses Soft Bone to weave concealed bone mesh and layered defenses around the Senju Clan Grounds. 45
Bone Armor Mode
Bai Ye can cover much of his body in interlocking bone plates, shielding his skin from direct attacks and preventing Chiba's poison from reaching his blood through ordinary contact. 22
- Closes exposed wounds beneath layers of bone armor. 22
- Produces blades from armor gaps around his joints to cut attacking vines. 22
- Absorbs chakra entering through damaged armor, initially neutralizing poison spores before they can reach his body. 22
- Can tear out and replace poisoned sections of bone, including ribs, in an attempt to expel toxins. 24
- Is vulnerable to attacks that break through the armor and enter his chakra pathways directly. 24
- Becomes increasingly costly to maintain as his injuries and calcium depletion worsen. 23 24
Bracken Dance (Incomplete)
Bai Ye uses an incomplete form of Bracken Dance by extracting his spine, reshaping it into a large bone spear, and attempting to plant its branching bone structures into a target. 23
- Forms the weapon by pulling vertebrae from the back of his neck. 23
- Condenses the vertebrae into a spearhead with branching bone protrusions. 23
- States that the complete technique requires planting bones into the earth; his version can only “plant” them into one person. 23
Parasitic Chakra
A black parasitic chakra remains embedded within Bai Ye's bones and is connected to a mark beneath his collarbone. It was implanted by the people who experimented on him. 24
- Activates through the collarbone mark and causes uncontrollable flesh growth beneath his bone armor. 24 25
- Spreads through bone matter absorbed by another person. 24
- Contaminated Chiba's newly evolved Skeletal Reinforcement framework after Chiba absorbed Bai Ye's bones. 24
- Was used by Chiba as a pathway to return paralytic poison into Bai Ye's chakra nodes, leaving Bai Ye unable to generate new bones during their final exchange. 25
- Appears to function as a tracking mechanism for Bai Ye's laboratory pursuers when its chakra signal is exposed. 25 26
- Is concealed, but not removed, by a wooden insulating layer beneath Bai Ye's collarbone. 26 36
Defensive and Combat Training
After becoming Chiba's ally, Bai Ye developed practical defensive and tactical skills in addition to his direct Shikotsumyaku combat. 34 45
- Repairs structures and reads written repair records despite his laboratory upbringing. 34
- Uses bones to reinforce the Senju Clan Grounds' walls, cover Root Network gaps, and create layered warning, trapping, and lethal perimeter defenses. 34 45
- Serves as the designated cutting fail-safe during Chiba's dangerous natural-energy cultivation, severing unstable roots on command. 84
- Can pressure Chiba in controlled lethal sparring, forcing improvements in Chiba's Half-Sage Mode stability and combat response. 87
Relationships
- Senju Chiba — Former enemy, current ally, clan head, and training partner. Chiba initially pursued Bai Ye for a Shikotsumyaku sample, but defeated him without extracting from him and offered him a choice between leaving and joining the Senju Clan Grounds. Bai Ye accepted a mutual-survival alliance, protects the grounds in Chiba's absence, and increasingly trusts Chiba to leave his back exposed during combat and defense. 21 25 26 34 45 50 81 87
- Haku — Fellow bloodline survivor and co-resident of the Senju Clan Grounds. Bai Ye initially confronted Haku with a bone blade to test his identity and intentions, but accepted him after Chiba vouched for him and Haku chose to stay. They later cooperate in monitoring and controlling Chiba's dangerous Sage Body training. 81 84 87
- Asuma Sarutobi — Chiba's instructor, whom Bai Ye calls “Smokehead.” Bai Ye is wary of Asuma's presence but recognizes that Chiba permits him into the clan grounds; he has observed Asuma's training and sparred alongside Chiba during Metal Wood practice. 42 45 51 59
- Unnamed laboratory captors / Hidden Sound Village pursuers — Former captors who imprisoned him in a tank, extracted his blood, administered drugs, implanted the parasitic chakra within his bones, and continue pursuing him from a mountain laboratory in the Land of Rice Fields. 21 24 26
Notable Quotes
“Kaguya Byakuya is the man you can't kill.” 22
“They only taught me how to lie down. And how to kill.” 22
“I'm the only Kaguya left too.” 25
“Now there are two.” 50