Ultraman Tregear is a major antagonist in Ultraman Taiga. Once a former friend and ally of the Ultra Warriors, he becomes a dark and manipulative figure who embraces chaos, despair, and destruction. Tregear serves as the primary driving force behind many of the series’ conflicts, influencing events from the shadows and testing Taiga’s resolve. His role is that of a fallen Ultra and powerful villain whose presence shapes the emotional and moral struggle of the story.