kimura | 木村, "tree village"
konohagakure no sato | 木ノ葉隠れの里, "hidden leaf village"
katon | 火遁, "fire release"

Renowned as the 'Servants of the Leaf', the Kimura are a people whose origins predate the Hidden Leaf Village. Much of their early history is unknown, even to the members, however they were present in the Fire Country during the Warring States Period. During this time, their people were ravaged by the warfare of the period and, at the brink of extinction, were saved by the Senju Clan. The Elder of the Kimura and his honour-rich people felt indebted to the Senju and joined them in their battles, defending the saviour of their people to their last breath.

When time came to found Konohagakure, the Kimura were one of the first clans to back the Senju. Because of their aforementioned nickname as the 'Servants for the Leaf' and their traditional feeling of being indebted to the Senju, the Kimura's population have been consistently low compared to other clans, as they are often the first to field themselves in battle, and their historically reckless manner of combat lead to high casualties. The Kimura have been heavy involved in all of Konoha's conflicts, including the Shinobi Wars, invasions, and battles. Even in present day, their loyalty to the village is renowned, as is their penchant for being conservative, as many of the traditions they had during the Warrring States Period continue to persist.

Ryūō no musuko (竜王の息子, meaning "sons of the dragon king") refers to the Kimura's three main abilities: "Ibugan", "Ryū Kokyū", and "Ryūō no honō".

Ryūō no honō (竜王の炎, meaning "flame of the dragon king") bestows upon the user the first flame of the Dragon King. This ability is twofold; the Dragon King cannot be harmed by his own flame, and so too have his clansmen inherited this immunity. A Kimura cannot be burned by their own techniques under any circumstance, be it intentional or otherwise; they are entirely immune to their own fire techniques. Additionally, Kimura are immune to residual, unenhanced fire, be it a product of their own hand or another's, so long as there is not chakra present in them. The second ability is the Dragon King's fire itself, notorious for being unfathomably hot, which empowers the user's Fire Release techniques with incredible, innate damage, granting them maximum damage for the rank of the technique for free.

Ryū Kokyū (呼吸, meaning "dragon's breath") allows the user to instantly mould chakra in their their lungs or stomach and utilize breath-based techniques without employing the use of hand seals or other activation requirements. This allows them to entirely circumvent the necessary preparations for utilizing such techniques, granting them the "No handseals" effect for free on techniques that employ the aforementioned casting descriptors.

In addition to these three main abilities, the Kimura also accrue a 20% reduction to WC and Ryo cost when training and purchasing Fire Release techniques.

Ibugan (燻眼, meaning "eye of cinder") is a dōjutsu that grants the user the ability to see radiation in the long-infrared range of the electromagnetic spectrum, thus allowing them to produce "thermograms" and effectively see the heat--or lack thereof-- of beings and objects at varying levels of efficiency and definition, thus making it possible to see one's environment with or without visible illumination. The range, proficiency, and auxiliary effects bestowed to the user of Ibugan depend on the rank being used. Ibugan is a notably distinct dōjutsu whose various stages of ability do not change aesthetically and typically remain the same glowing, fiery orange-red hues with slitted pupils, however there are occasionally slight deviations in hue.

Spoiler:

• Ibugan is susceptible to blinding flashes of light, and sustain one additional post of blindness whenever it is active and the user is blinded by such effects.
  
• Kimura must take Fire Release as their primary element.
  
• Kimura cannot generate or utilize any water techniques or water-aligned abilities on items, scrolls, weapons, or armour, and cannot learn to use Water Release.
  
• Kimura sustain +1 rank of damage from offensive Water Release jutsu, identical to the degree of damage from the original damage source. (i.e max D-Rank damage would become max C-Rank.)
  
• Kimura can only use techniques that are not fire release at their shinobi rank or lower. They are capable of using fire techniques one rank above as usual.
  
• Kimura are especially susceptible to genjutsu, thus when escaping such illusions, they require pain or kai of 2-ranks higher than the genjutsu's rank to do so.
  
• Kimura must take the Hesitant (Element) negative special characteristic, which cannot be balanced with a positive.
  
• Kimura must take the following negative special characteristic, which cannot be balanced with a positive:
  

  Undying Devotion: