As part of his training, Kentaro had to experience and accept 10 pure emotions: Joy, Sorrow, Anger, Hatred, Confusion, Passion, Serenity, Loss, Envy, and Emptiness. These helped him awaken past stage 2 to stage 3, in which he could share the ki of others, and the forbidden stage 4, in which he would have drained life force from everything around him. However, he managed to pass through to his own true Raging Tiger: Musou GekiKoh, or Nil-Thought Raging Tiger.

In this stage, while he lacks the primal fury, massive muscles, and feral appearance, Kentaro is in a state of calm, and his power, speed, and instincts are greatly increased compared to the others. However, there are many things about this that he has yet to learn.