Kōga-ryū is fundamentally different from all other fighting styles. This is because unlike other fighting styles it doesn't have an organized method of fighting with certain rules. It is a fighting style that is a lot more flexible to the point that learning other fighting style is part of its training. This led opponents to describing Kōga-ryū as "unorthodox", "dishonorable", or "unfair" because of how limitless Kōga-ryū's potential is and just how far shinobi of the fighting style are willing to go to achieve their goals.