≪Equipment Smith≫ Edit
-<<Equipment Smith>>, whose real name is Edward Walker is K's supervisor. He also one of the only ones that talk to him face to face.
Tooru Kokonoe Edit
-The student of the Kouryou Academy and also his greatest rival. Because of Tooru's resolve in protecting his friends resemble his (presumably) past self, K is extremely disgust over Tooru as he mocks Tooru's value of friendship and even willing to hurt his friends in order to break Tooru, both physically and mentally.
Lilith Bristol Edit
During the mission to retrieve Lilith for <<Equpiment Smith>>, K spoke to Lilith with respect and courtesy. However he was not above resorting to cruel methods if needed in order to fulfill his mission.
When the two of them met again, he asked Lilith to let him take Sakuya, since she(Lilith) was not the goal of his mission this time. However Lilith refused to comply to his demands, forcing him to attack her and knock her unconscious before taking Sakuya.