Plague Knight has a somewhat reckless personality and notably treats several of his allies with contempt or indifference. With the exception of Tinker Knight, he treats all of the Order of No Quarter with disrespect, often gleefully attacking them and being entirely unapologetic at the Battle Royale. While he brushes off most criticism without second thought, Specter Knight is able to reduce him to stunned silence by commenting on his cowardice regarding his feelings for Mona. He is insecure about his lack of strength and power, believing that he needs the Ultimate Potion to become powerful enough for Mona to love him.