DX-4 is the main antagonist in Dragon Wars. An ancient demonic sorcerer, he will stop at nothing until the Elemental Realm is consumed and that the DX-Clan will rule. 15 years ago, the Elemental Dragons of Fire, Earth, Water, Air, and Light sealed him away for using elemental magic for his own evil deeds. Unlike any other villains, he treats Void 4, Pretty Cure, and the DX henchmen with respect.

In the Fire Dragon saga, it is revealed that DX-4 is not in his true form.