Four, whose real name is Tobias Eaton, is a fictional character from the Divergent series written by Veronica Roth. He is a member of the Dauntless faction, known for his bravery and strength. Four is a skilled fighter and plays a significant role in the story as a mentor and love interest to the protagonist, Tris Prior. Four has a complex background, having grown up in the Abnegation faction before transferring to Dauntless. He struggles with his identity and the expectations placed upon him, which makes him a relatable character. His journey involves overcoming personal fears and navigating the challenges of a dystopian society.