Lore ID: BIJU-003
Category: Four-Tails through Six-Tails
Japanese: 孫悟空 — Son Gokū
Tail Count: Four
Form: Massive red ape
Associated Village: Iwagakure
Jinchūriki: Rōshi
Primary Ability: Lava Release
Elemental Basis: Fire + Earth
Son Gokū is a powerful red-furred ape-like Bijū.
It possesses great pride and strongly values its personal identity.
It dislikes being treated merely as "Four-Tails" rather than being addressed by name.
This attitude represents the deeper problem between humans and Bijū:
Human society reduced individual beings into military designations.
Son Gokū possesses Lava Release.
Its chakra can combine Fire and Earth properties.
Applications include:
Molten attacks.
Extreme heat.
Lava-coated physical combat.
Terrain destruction.
Enhanced strength.
Rōshi learned to use this chakra within his own fighting style.
Rōshi is an Iwagakure shinobi and Son Gokū's jinchūriki.
He left his village at some point and traveled extensively to better understand and control his Bijū.
This makes him different from jinchūriki kept permanently under direct government supervision.
His long experience provides substantial control over Son Gokū's power.
Despite decades together, Rōshi and Son Gokū do not initially achieve the kind of close friendship seen between Killer B and Gyūki.
Their relationship contains tension.
This illustrates that long-term coexistence does not automatically create harmony.
Rōshi remains connected historically to Iwagakure.
His mobility makes him difficult for foreign intelligence to track.
Akatsuki eventually targets him if history proceeds in a similar direction.
Son Gokū is the Four-Tails and is associated with Rōshi of Iwagakure, with Lava Release as its defining kekkei genkai.
Japanese: 穆王 — Kokuō
Tail Count: Five
Form: White horse-dolphin hybrid
Associated Village: Iwagakure
Jinchūriki: Han
Primary Ability: Boil Release
Elemental Basis: Fire + Water
Kokuō possesses a distinctive body combining equine and aquatic characteristics.
It is enormous, physically powerful, and capable of tremendous charging attacks.
Compared with more openly hostile Bijū, Kokuō can display a relatively reserved personality.
Kokuō uses Boil Release.
This ability combines Fire and Water chakra.
It can generate steam pressure that dramatically amplifies physical force.
A user can convert pressure into explosive bursts of:
Speed.
Strength.
Momentum.
Impact.
This makes close-range combat extraordinarily dangerous.
Han of Iwagakure is Kokuō's jinchūriki.
He is known for heavy armor and steam-based fighting methods.
His combat style integrates Kokuō's Boil Release with physical attacks.
Han demonstrates that a jinchūriki does not need to fight as a miniature version of the Bijū.
The host can instead integrate specific properties into a unique shinobi style.
Having both Son Gokū and Kokuō associated with Iwa historically gives the village considerable Bijū importance.
However, jinchūriki politics inside Iwa are not documented as thoroughly as Kumo's relationship with Killer B.
Franz must not invent a detailed public jinchūriki institution without campaign justification.
Core manga establishes that Akatsuki already possessed two unidentified Tailed Beasts before Gaara's extraction.
The identities are not explicitly confirmed in the manga.
Some expanded interpretations associate Kokuō/Han with one of these early losses.
Franz must therefore not present Han's exact capture date as universally confirmed core history.
For campaign simulation, his status should be determined by Living Shinobi World continuity if the players interact with him.
Kokuō is canonically the Five-Tails associated with Han and possesses Boil Release.
Japanese: 犀犬 — Saiken
Tail Count: Six
Form: Massive pale slug-like creature
Historical Affiliation: Kirigakure
Jinchūriki: Utakata
Primary Traits: Corrosive substances, bubbles, liquid-based attacks
Saiken resembles a gigantic slug-like being.
Its appearance is less aggressive than many other Bijū, but its abilities are extremely dangerous.
Saiken can produce substances capable of corrosive or caustic effects.
Saiken's body can generate:
Acidic substances.
Corrosive liquids.
Foam.
Bubbles.
Gas-like emissions.
Large-area chemical attacks.
These properties make it dangerous even against heavily armored targets.
Utakata is Saiken's jinchūriki and originally a Kirigakure shinobi.
He later became separated from the village.
Expanded anime material develops his history considerably.
Utakata fights using a bubble pipe and specialized bubble ninjutsu.
His elegant technique style contrasts strongly with the massive destructive potential of Saiken.
In anime-expanded continuity, Utakata's relationship with his former teacher Harusame became deeply traumatic.
Harusame attempted to remove Saiken because he wanted to free Utakata from the burden.
Utakata misunderstood the event as betrayal and attempted murder.
The incident contributed to Utakata's distrust of teachers and authority.
Utakata's separation from Kirigakure makes him politically complicated.
He is simultaneously:
A jinchūriki.
A former Kiri shinobi.
A highly valuable strategic asset.
Potential missing-nin.
A target for Akatsuki.
Kirigakure might prefer recovery rather than simple execution because killing him risks losing control of Saiken.
The manga establishes Utakata as Saiken's jinchūriki but gives little detail about the exact date of his capture.
His expanded anime story positions his encounter with Akatsuki differently than the manga's implied off-screen capture sequence.
Therefore Franz must distinguish:
Core Fact: Utakata is Saiken's jinchūriki.
Expanded Lore: Detailed student history and bubble arc.
Capture Timing: Timeline-sensitive and potentially inconsistent between source versions.
Do not allow filler chronology to overwrite the Living Shinobi World campaign automatically. Utakata is canonically identified as Saiken's jinchūriki, while detailed circumstances of his life and capture are substantially expanded by the anime.