Narushima Koga

Koga's grandfather raised him as his parents were not a part of his life. Growing up, Koga believed that he was powerless and grew to loathe being weak. At some point, his grandfather dumped him at a karate dojo to teach him morality. It proved to be a pointless endeavor, as Koga used it only to attain power.

Koga mentioned to Kaede that he hadn'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 the organization kicked him out for getting into fights.

Three years before Kengan Omega, Koga bumped into Ohma while the former was out with his posse. Annoyed by Ohma's nonchalance and perceived rudeness, Koga and his posse attacked only for Ohma to trounce them all, calling Koga weak.

Koga is a brash, somewhat arrogant young man who has an intense thirst for overwhelming violent power; to that end, he harbors 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. He acts like a backwoods delinquent, for better or worse, though he is gentle towards close friends but shows open hostility against those he considers his enemy. His demeanor is slowly changing after meeting Yamashita Kazuo and the others.

After the Merger Tournament, Koga became calmer and more mellowed out. He was far more amicable with Ohma, with the latter even going so far as to teach him the Niko Style because he asked. His habit of wishing to be trained by various fighters, even the ones who just defeated him, earns him respect and connections with them such as Ohma, Utsubuki Kokuro, Funayama Yoshiki, Carlos Medel, Liu Dongcheng, Kanoh Agito and Rolón Donaire. Medel himself gives much praise for this "greedy" trait, believing not just anyone can do it.

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

Japanese Name: 成なる島しま 光こう我が

Romanized Name: Narushima Kōga

Epithet(s): The Fist Eye (拳けん眼がん, Kengan)

Age: 20

Birthday: September 18th

Height: 181cm (5'11")

Weight: 80kg (176lbs)

Gender: Male

Affiliations: Yamashita Trading Co. Purgatory (Loaned Fighter) Supernovas Rokushin Kaikan (Formerly)

Occupation: Underground Fighter

Fighting Style: Rokushin Kaikan Karate Mixed Martial Arts Boxing Niko Style (Basics) Gaoh Style (Basics)