Board Thread:General Discussion/@comment-11660317-20170808134349/@comment-28814491-20170815200258

Soul modes usually seem to have nothing to do with the trait itself, but instead are based on the weapons they used. The blue SOUL jumps, relating to ballet shoes because ballet has to do with jumping, while a frying pan could be used to block Undyne's spears. The yellow SOUL mode is given a gun, just as the SOUL of Justice had, while the you could think of the purple SOUL as moving along the lines of a notebook. Magic attacks, however, seem to be based on the Trait colors. Green magic kindly heals you, and you must patiently stand still as the blue attacks go through you, and bravely move through the orange magic. Therefore, and Orange or Light Blue Soul mode would most likely relate to the weapons, not the traits themselves.