No one knows what the "DM" stands for, but people respectfully call him "DiMi".
So-called the "emperor of all human chimeras", DiMi is an ancient entity from as early as 8000 B.C. when he came to Earth in search of knowledge and to learn and study what the humans do. As a result of his influence, he began to convert some of his disciples into his mercenaries, thus establishing the human chimera creatures.