One of the onis long time combat traditions is sumo. Testing their mettle against one another with nothing but their own bodies as weapons, also known as Kongo due to the beating of drums, their strikes and blows, and their own battle ready hearts beating in unison.

There is also Agyongo, utilizing their Anima in battle with the weapon of their choosing, they fight until the other submits or is beaten and knocked unconscious. A more dangerous but equally as rewarding sport for them.