Demigra, also known as Demon God Demigra, is a recurring antagonist in the Super Dragon Ball Heroes anime and related promotional media. His origins trace back over seventy-five million years, where he initially served as a wizard in the Heavenly Realm alongside Chronoa, the future Supreme Kai of Time, helping to raise the divine time bird Tokitoki. However, driven by a deep-seated ambition for greater power and authority, Demigra began conducting forbidden experiments on Tokitoki, causing dangerous distortions in the flow of time. When Chronoa discovered his treachery, a conflict erupted. Demigra, alongside his two wizard allies Putine and Gravy, fought against Chronoa but was ultimately defeated. For his crimes, he was sealed away within a dimensional void known as the Crack of Time, a prison where he would spend eons honing his magical power and resentment.

Personality wise, Demigra is defined by an overwhelming god complex and an unshakable belief that he is an almighty deity who deserves to rule over all of time and space. He is immensely proud, arrogant, and self-assured, viewing the true guardian of time, Chronoa, as an unworthy obstacle he refers to with contemptuous nicknames. Despite admitting to his nature as a demon, he insists on his own divinity and refuses to be bound by the universe's natural laws. His seventy-five million years of imprisonment have made him extremely patient and tenacious, qualities he takes great pride in, and he dismisses any suggestion that he might have given up on his plans. Demigra is also highly deceitful and calculating, willing to temporarily aid his enemies, including the Time Patrol, if it serves to eliminate a rival or further his own long-term goals. He enjoys toying with his opponents and can be sadistic, taking pleasure in forcing heroes to fight their brainwashed allies. His arrogance is so profound that he once believed himself capable of controlling Beerus, the God of Destruction, a miscalculation that nearly led to his destruction.

Demigra's primary motivation is the usurpation of Chronoa's position as the Supreme Kai of Time. He seeks to claim the time bird Tokitoki for himself, believing that by absorbing its power, he can attain true godhood and reshape all of history and the universe according to his own desires. He is hellbent on destroying the existing timeline to create a new one where he can reign freely as a god, answering to no one. In the Super Dragon Ball Heroes narrative, his motivations evolve slightly as he confronts even greater threats, but his ultimate ambition to rule over time remains the core of his character.

Within the story of Super Dragon Ball Heroes, particularly during the Dark Demon Realm Saga and its subsequent arcs, Demigra plays a complex and pivotal role. Initially emerging as a major threat from his imprisonment, he seeks to conquer the Time Nest and claim Tokitoki. However, when the ancient and far more powerful Dark King Mechikabura is revived, Demigra is forced into an uneasy and temporary alliance with the Time Patrol. Recognizing Mechikabura as a rival who would also seek to control time, Demigra agrees to a ceasefire, providing crucial assistance to the heroes. He uses his knowledge and magic to support them, even acquiring a special Power of Light from Dark Shenron to counter Mechikabura's darkness. This alliance is purely pragmatic; Demigra has no loyalty to the Time Patrol and after Mechikabura's defeat, he returns to his own schemes, retreating into the shadows to await his next opportunity.

Key relationships define Demigra's position in the world. His most significant relationship is with Chronoa, the Supreme Kai of Time, whom he views as a rival and a usurper of the power he believes is rightfully his. He also has a complex history with Mechikabura, having once served as his subordinate in the Dark Empire before breaking away to pursue his own ambitions. In Super Dragon Ball Heroes, he is often accompanied by his loyal secretary, Robelu, and other demon allies such as Gravy and Putine, though he primarily uses them as tools to achieve his own ends.

In terms of development, Demigra undergoes several powerful transformations throughout the series. He starts as a powerful wizard, but after absorbing the time bird Tokitoki, he ascends to a true Demon God state. Later, to combat Mechikabura, he acquires the Power of Light, transforming into a new, more radiant form. His quest for power does not end there; in later arcs like the Ultra God Mission, he absorbs the Dark Factor left by Mechikabura, becoming the new Dark King and achieving forms such as the Full-Powered Dark King and ultimately a Time Power Unleashed state, making him one of the most formidable villains in the game's history.

Demigra possesses a vast and versatile array of notable abilities. As a master wizard, his primary skills revolve around powerful dark magic. He can control the minds of others, as demonstrated when he brainwashed powerful warriors like Trunks: Xeno. He can fire destructive energy blasts such as the Seasoning Arrow and Chaotic Gigantes. He is capable of summoning allies to his side, including Gravy, Putine, and even dark versions of other characters. Later, after absorbing Tokitoki, he gains control over Time Power, allowing him to manipulate the fabric of history. He can also create powerful energy barriers, teleport, and transform into several enhanced states, including his Final Form, a giant monstrous shape, and the Makyoka form, each granting him a significant boost in power and new magical techniques.