Growing up, Gaku never felt that he fully fit in with either the local Japanese or Korean communities. Gaku Kazemaru was born in Illinois to immigrant parents from Japan, his mother being of Korean heritage. His usual alternate outfit consists of jeans, black shoes, a black t-shirt, and a tan jacket in either a blazer or bomber style, and a pair of aviator shades. His Tekken Tag Tournament costume replaces the foot pads with blue sneakers, and adds a black and white sports jacket. His usual sparring outfit consists of black dobok pants with a black belt, a red t-shirt, and blue sparring pads. In most artistic depictions, however, his hair is often depicted as a dark green, and his hair in the games is said to have a very dark green tint to it. He has short black hair with messy bangs, and a lean yet muscular build. Gaku is a young man of mixed Japanese and Korean descent. Gaku's primary style is Taekwondo, with some nuances of other styles such as kickboxing, Karate, and Jujutsu. Other than martial arts, Gaku is said to enjoy Korean music, dancing, video games, and traveling. Gaku is what one would call a chivalrous pervert he constantly ogles attractive women, but at the same time, he genuinely cares for them as people, and would never disrespect a person based on their gender alone, nor would he hold back against a female fighter solely because she is a woman. In combat, however, he appears to be far more hot blooded and sarcastic than usual, often making fun of his opponents. Normally, he is said to be an easygoing but caring man. Gaku is said to have slightly different personalities in and outside of combat.