When Shoto Todoroki learns that Dabi is actually his long-lost brother Touya, he experiences a mix of shock, disbelief, and emotional turmoil. Initially, Shoto struggles to come to terms with the revelation, as it shatters his perception of his family and his understanding of himself. He grapples with complex emotions, including guilt over not knowing about Touya's suffering and anger towards his father, Endeavor, for his role in Touya's transformation into Dabi.