Narushima Koga
Narushima Koga
Kanji: 成島 光我 (なるしま こうが)
Romaji: Narushima Kōga
Status: Alive
Age: 20[1]
Gender: Male
Affiliations: Yamashita Trading Co.
Relatives: Narushima Joji (distant relation)
Omega Debut: Chapter 0
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Narushima Koga (成島 光我, Narushima Kōga; "Koga Narushima"), is a young man who wishes to enter the underground fighting scene in order to attain greater fighting strength. He has some history with Tokita Ohma.[1]


A young man, Koga has a lean muscular build, green eyes and wavy spiked hair; his hair and eyebrows are both bleached white[2] (his natural hair colour is dark).[3] And, outside of his karate gi, he has been shown wearing a button-up dress shirt over a white under-shirt with a gold chain necklaces, white pants and loafers. Koga tends to dress in very stylish, expensive-looking clothes.


Koga is a brash, somewhat arrogant young man who has a strong thirst for overwhelming violent power; to that end, he harbours an underlying inferiority complex stemming from his crushing defeat to Tokita Ohma three years prior. Koga is short-tempered and quickly flies off the handle when his buttons are pressed. Despite this, he can be polite when he wants to be and is also surprisingly diligent, working hard so that he doesn't have to owe anyone.


Koga was raised by his grandfather as his parents were not a part of his life. Growing up, he was pissed off every day (due to his own perceived powerlessness). At some point, his grandfather dumped him at a karate dojo (in an attempt to teach him morality), though Koga used it to attain power.[3]

Koga mentions to Kaede that he hasn't studied since the fourth grade, and was frequently truant from the fifth grade onward.

At some point, Narushima Joji helped him get into the Rokushin Kaikan, but he was eventually kicked out for getting into fights.[2]

Three years prior to the start of Kengan Omega, Koga bumped into Tokita Ohma when he was out with his posse. Annoyed by Ohma's nonchalance and perceived rudeness, Koga and his posse attacked but were easily defeated by Ohma, who finished by calling Koga weak.[4][3]


After challenging and taking down the entirety of the Ken'okai Hybrid Karate Dojo, Koga met up with his friend Asari Kosuke. With Asari chastising him for his actions, he then caught Koga on to the idea that there may be stronger opponents if they looked on the Dark Web. Meeting up later, Asari enlightened Koga about the Kengan matches. Seeing a familiar face, Koga told Asari to do more digging.

Eventually, after being led to Yamashita Trading Co., Koga met the CEO Yamashita Kazuo. Explaining his desire to enter the Kengan matches, Kazuo casually agreed and brought him down to watch a Kengan match featuring Imai Cosmo. Seeing the level of fighting on display, Kazuo coolly informs Koga he was not strong enough to be a part of their world. Undeterred, Koga said he would become the strongest. At that, Kazuo offered Koga a job which the latter accepted.

Living at the Yamashita residence, Koga began working at Yamashita Trading Co. where he met Akiyama Kaede for the first time. Some time during the day an unexpected visitor with the same face as the the man who beat him down 3 years ago. Flying into rage due to the mistaken identity, Koga attacked the individual but was effortlessly parried and quickly overwhelmed until Kazuo suddenly returned and broke them up. While still somewhat irate, Koga then witnessed Ryuki get immediately accepted as a Kengan fighter.

Infuriated that Ryuki was made a fighter ahead of him, Koga was incensed further when he encountered Ryuki eating breakfast at the Yamashita residence. Angered by Ryuki's mere presence, Yasuo managed to make Koga see reason. However, when Ryuki told him he was too weak to become a fighter, Koga quietly stormed off. In the evening, he called out Utsubuki Kokuro to a deserted alleyway and challenged him for his spot as an affiliated fighter. Despite a confident start, Koga was quickly knocked out and hospitalised (after Kokuro rang him an ambulance).

The next day, a bandaged up Koga went to the Kengan match with Akiyama and vowed that he would discern the mechanics of Kokuro's special technique during Kokuro's fight with Ryuki.

While witnessing the fight, Koga was able to successfully perceive Kokuro's Stinger when it was used on Ryuki and understand how it worked. However, he was unable to properly determine how Ryuki's Crouching Earth Dragon was performed. A few days later, Koga reluctantly attended lessons on how the Kengan Association operated along with Ryuki. When they were introduced to Himuro Ryo and Kaneda Suekichi, Koga mouthed off and was struck in the face by Himuro, beginning a short confrontation between Himuro and Ryuki. During this confrontation, Koga was successfully able to percieve a weakness in the Crouching Earth Dragon, impressing Kaneda. 

Following this series of events, Himuro and Kaneda offered to take Koga and Ryuki under their wing and help them improve. Ryuki refused while Koga accepted, and Kaneda brought him to the SJPW training grounds to meet Sekibayashi Jun. Koga was initially skeptical of the value of Pro Wrestling training, even after failing to keep up with Sekibayashi in a squat workout. Sekibayashi offered to let Koga skip his training if he was able to last three minutes against Jose Kanzaki without being knocked down. Though Koga impressed Sekibayashi with his relentless attacks on Jose, they made little impression on the pro wrestler who did not even attack for most of the three minutes. Thanks to Jose's poor sense of time he did not press the attack until the three minutes ran out, but Koga was humbled by his inability to harm Jose and he conceded the match. After the match, Jose discovered Koga's wish to become a fighter and suggested that he join Purgatory instead of the Kengan Association. 

During his wrestling training, Koga had a day off and returned to Yamashita Trading Co. While there, he encountered Katahara Sayaka and Kure Fusui, and was informed about the Kengan Versus Purgatory Tournament to be held in six months. Yamashita offered Koga a chance to become one of the thirteen representing the Kengan Association if he became strong enough in six months. Koga left without telling Yamashita about Jose's suggestion about Purgatory.

Koga improved dramatically over the first two weeks of training; Jose put this down to him becoming better accustomed to the strength he already possessed. When Yamashita and Ryuki visited him at SJPW, Ryuki declared that Koga's strength as a fighter is a waste. After a short bout with Jose, Ryuki returned to the SPJW dojo when everyone but Koga had left and instructed him on footwork and positioning. Ryuki played 90 rounds of tag with Koga to help teach him footwork; Koga lost all but one round.

After another two weeks of training the SJPW crew left for a Pro Wrestling tour and Koga was sent to the Kureishi Dojo by Kurachi Karugo to continue his training. When he arrived he was nearly robbed by two motorcycle purse-snatchers but easily overpowered them. When one of them pulled a knife he was dispatched by Adam Dudley , who had become a student at the Dojo. Adam's first test for Koga was to successfully take a slap from him without being knocked down. After swiftly adapting to ice skating, Koga was able to pass Adam's test in an hour, before then meeting Kureishi Mitsuyo and Imai Cosmo.

Power & Abilities

Koga is shown to be a capable fighter, being able to take down the entirety of the Ken'okai Hybrid Karate School while sustaining few injuries of his own.[1] He has been noted to have done the same with three other Karate schools, as well as with kick-boxing and MMA dojos.[1] However, he is nowhere near the level of Kengan fighters. In Koga's brief scuffle with Gaoh Ryuki, the latter was in complete control and exerted seemingly no effort when defending himself against Koga's strikes.[5] Later, when challenging Utsubuki Kokuro for his position as an affiliated fighter, Kokuro quickly overwhelmed and defeated Koga without much trouble. Koga was said to have 2 weakness that he wasn't aware of which prevented him from becoming stronger: the precision of his footwork and his imbalance of tension and looseness. However Koga eventually overcame both weaknesses with the help of Ryuki (via a game of "tag")[6] and Kureishi Mitsuyo (via Adam Dudley's ice skating "lesson").[7]

After training under Sekibayashi Jun at the Super Japan Pro Wrestling gym, Koga's strength and conditioning improved greatly. While he hasn't finished the training yet, he has improved to the point that he can pull a man off a speeding motorcycle, simply by holding onto the bag he tried to steal from him.[6] Also, having trained his footwork with Ryuki, it has improved to the point he could nonchalantly dance around all of the attacks from the motorcycle thief's accomplice.[6]

Perhaps Koga's greatest ability is his amazing observation and martial intuition: Kokuro commended Koga for being able to somewhat glimpse his "Stinger" technique, something which others he had fought were not able to do;[3] by the second time he saw the Stinger, Koga managed to "see" it discerning just how the technique worked.[8] After challenging Koga to a game of "tag" to train his footwork, Ryuki noted that Koga managed to win once out of ninety, despite the fact he wasn't trying to let Koga win.[9] In his training with Adam, despite being a complete amateur in skating, Koga easily kept his balance after a few seconds and managed to pass Adam's test in just an hour.[10] During the Kengan match between Nitoku and Yuzaki Mumon, Koga was able to discern Nitoku's core fighting style after only seeing a few moves (which impressed Imai Cosmo).[11]

Notes & Trivia

  • Koga is most likely related to Narushima Joji, a character who appears in Sandrovich's other series Fist of the Seeker.
    • It was later confirmed that Joji is Koga's father's second cousin.[2]
  • After training with Super Japan Pro Wrestling, Sekibayashi Jun came up with a wrestler epithet for Koga, "Dream Crew Koga Jr.". Koga promptly refused the epithet however.[6]
  • Koga considers his father to be a deadbeat dad.[2]



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