Knife is most of all recognized as a huge jerk and enjoys mocking others. He has an extremely destructive and malicious attitude, being much of a bully to victims such as Paper and Marshmallow in particular. He is incredibly blunt and loud and says whatever comes to his mind, unafraid of hurting others whether it's physically or psychologically. He has shown to be lazy when he told Paper they didn't need to compete. However, he is also dedicated to completing challenges. He also has a soft side.