Balance is a Secret born from both Order and Chaos, who was left in the Castle of the Secrets during Bad Luck's reign. Balance would later on reappear during Shadow of Death to help power up Karma's abilities, alongside Twilight, who would assist Sangria, and Rebirth.
Balance is chaotic yet orderly. As is his sphere, he's not yet gained full control of the Balance, until around Shadow of Death. He's excitable and nice, social and outgoing. Balance though, has yet to fully understand his true purpose, and sometimes views his powers in different light when accidentally destroying valuable things.