Makoto Isshiki is a Mulian who works for TERRA. He is a clone sharing the DNA of Ernst von Bähbem. He has an inferiority complex which stems from being a D-ranked Mulian as a child when he was staying at the Bahbem Institute. He had abilities beyond what was expected of a D type, but he failed to recognize praise from others and let the "D" rating stop him. Because of this, he feels that he has to constantly prove himself. He also has an extremely haughty and arrogant attitude, and is contemptuous and dismissive of Ayato.