Cody Williams

Cody is one of of the main characters during The 15 Keys. He first appeared after Zach met Tahlia.

The 15 Keys:
Cody showed up after Tahlia left with the first Chronos Gem. He shows a deep knowledge of The keys, The Destroyer and who Zach really is. This was shown when Zach fought The Destroyer with only the blue Chronos Gem, and the green, while Cody scolded him for not using his full power in this situation. He was even able to identify that Zach was falling into his memories, and tells Tahlia and Hopey to step back as he could exert destructive Chronos energy.

Identity
None of the characters know who Cody used to be, and only Jayne and Tahlia knew him before The 15 Keys. However his identity is confirmed to be revealed during The 15 Keys 2 when Zach remembers how he first met him, and how he truly first met him.