Kazutora is one of the founders of Tokyo Manji Gang and has been portrayed as unstable, sadistic, and incredibly violent in the series. Despite appearing calm and polite when first introduced to Takemichi's group, he later revealed his true nature by breaking the legs of two of his "most trusted men" with a smile on his face.
After his second stay in prison, he got the help he needed and integrated back into life. He remains quiet, his emotional strain still apparent at times, but appears to be more well managed. As an adult, Kazutora has recovered fully. He can speak normally with others as well as react to events emotionally. He also shows regret for his past actions and is at heart incredibly loyal to both Toman and Mikey.
Kazutora is a very broken soul; as a child, he was forced to pick between his mom and dad in a case of domestic violence. Both of his parents never showed him love, and his only childhood friends used him for money. As a result of his fundamentally non-existent family life, he scorned upon other happy families. Something as simple as seeing children having tender moments with their parents, triggered a sore spot within Kazutora and irritated him deeply.