At the end of The Teal Mask story, he vows to beat the Player Trainer with a sinster smile. In the start The Indigo Disk story, Kieran has a huge change in his personality, being more serious, contantly annoyed and in special, determined, as Carmine says that he's training nonstop day and night just so he can become stronger and finally best the player, going as far as skipping sleep, causing black circles to appear around his eyes.