Ammu is a central character in the novel "The God of Small Things" by Arundhati Roy. She is the mother of fraternal twins, Estha and Rahel, and her life is marked by societal challenges and personal struggles. Ammu's character embodies themes of love, loss, and the impact of family dynamics within the rigid caste system of Kerala, India. Ammu's relationships, particularly with her children and her forbidden love for Velutha, a man from a lower caste, highlight the complexities of social norms. Her defiance against societal expectations ultimately leads to tragic consequences, shaping the lives of her children and reflecting the broader themes of the novel.