Kenpo emerged as the core around which this new art was built. Although unaccredited by name, other influences included American Boxing (Choo was Hawaiian Welterweight Champion) and Escrima (Emperado also studied Kali and Arnis Escrima).
In the late 1940's, Palamas Settlement was a violent area and fist-fights or stabbings were commonplace. From this environment, the founders of Kajukenbo wanted to develop an art that would be readily usefull on the street. As they trained and fought in and around Palamas Settlement, the founders of Kajukenbo quickly gained reputations as formidable street-fighters. In 1950, Adriano Emperado, along with brother Joe Emperado, began teaching the new art in an open class. They called the school Kajukenbo Self Defense Institute (K.S.D.I.).
The emphasis during training was on realism - so much so that students routinely broke bones, fainted from exhaustion, or were knocked unconscious. Nevertheless, the reputation of this tough new art drew more students and Emperado opened a second school at the nearby Kaimuki YMCA. Soon Emperado had 12 Kajukenbo schools in Hawaii, making it the second largest string of schools at the time. John Leoning, who earned a black belt from Emperado, brought Kajukenbo to the mainland in 1958. Since that time, Kajukenbo has continued to flourish and grow.
From it's beginnings, Kajukenbo was an eclectic and adaptive art. As time has passed, Kajukenbo has continued to change and evolve. Currently, there are a few distinct, "recognized" branches of Kajukenbo: Kenpo ("Emperado Method" or "Traditional Hard Style"), Tum Pai, Chu'an Fa, Wun Hop Kuen Do, and Gaylord Method. In addition, there are numerous "unrecognized" branches, including CHA-3 and Kenkabo. While this may be confusing for an outsider, it is the essence of the art. Students are not required to mimic the teacher, but are encouraged to develop their own "expression" of the art.
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