Tomura Shigaraki, originally named Tenko Shimura, has a deeply tragic and complex backstory that has significantly shaped his path to becoming a villain in "My Hero Academia." **Early Life:** Tenko was born into a family with a troubling dynamic. His father, Kotaro Shimura, had a deep-seated resentment towards heroes due to his own mother's abandonment. Tenko exhibited early signs of his "Decay" Quirk, but his family, particularly his father, harshly punished any talk of heroism, resulting in severe emotional and physical abuse. **Quirk Awakening:** One night, in a fit of anger and desperation, Tenko's Quirk manifested uncontrollably, leading to the accidental death of his entire family, including his beloved sister Hana. Left alone and traumatized, Tenko wandered the streets until he was discovered by All For One, a powerful villain. **Manipulation and Transformation:** All For One took Tenko in, giving him the new name, Tomura Shigaraki, and nurturing his hatred towards heroes. Under All For One's tutelage, Shigaraki's violent tendencies and destructive abilities flourished. All For One's manipulation turned Shigaraki into the leader of the League of Villains, positioning him as a key figure in the villainous fight against hero society. Shigaraki’s story is one of pain, manipulation, and a twisted quest for revenge, making him a complex and formidable antagonist in the series.