Terra was a weilder who had fought for the light, but the darkness in is heart clawed at him, causing turmoil between his master Eraqus, and concern from his training partners and friends, Ventus and Aqua.The left side is to represent of his normal self, and the right is the darkness he eventually succumbs to after Master Xehanort takes his Heart and Mind, but to this day for over 11 years, his Mind resists