I've given Kuranpu thought. It's a really hard one to do without bringing up cliché good and evil concepts, though I guess the yin and yang part lends itself naturally to that.

How about a different take maybe?

The belief that KURANPU is the greatest mediator of all lies in the rumours of its split personality. Its darker, tranquil side and its lighter, aggressive side are thought to be used in different situations.

It is believed that KURANPU's personality will shift to reflect one that it meets. Philosophers have long searched for it, believing it holds the key to understanding the human race.