"King is a cold-hearted Darkner with little compassion towards his subjects and only considers his own wishes. He appears to be power-hungry, evident by his constant wishes of gaining control of the World along with his following of Knight's plan to capture the three other kings. King also displays signs of abuse towards his son Lancer, in which he often neglects him and even uses him as a hostage to gain the upper hand in battle. During the final fight, it is revealed that King's loyalty lies solely with the Knight, and that he'll do anything to avoid failing them; to the point of threatening to kill Lancer if Kris, Ralsei, and Susie do not surrender." (King, Deltarune Wiki)