Kinpachi is the strongest member of the Roofworlders, an organisation that resorts to living in peace on rooftops. Although physically strong and able to even contend with Earth of the The Four Elements, Kinpachi has also been trained by Kotomi-Sensei to remain quiet and sneak on his opponents, something he managed to do to Joe Musashi.
Kinpachi is the one who captures Musashi on the rooftops, sneaking up to him before placing a bag over his head. Once the confusion has been cleared, Kinpachi works alongside the Shinobi, alerting him when the Elements arrive with The Yakuza. In the second fight with them, he exhibits magical attacks that give him an advantage in battle. Later, Kinpachi fights personally with Earth and is able to defeat him by lifting him off the ground and throwing the helpless Earth into the sky before punching him upon his return.
At first, Kinpachi appears to be capable of not much more than basic speech, grunting at Musashi rather than talking to him directly. However, he is later seen to taunt Earth, explaining exactly how he is going to defeat him.