Kainene is a fictional character from the novel "Half of a Yellow Sun" by Chimamanda Ngozi Adichie. She is the twin sister of Olanna and is portrayed as strong-willed and independent. Kainene runs a successful business during the Nigerian Civil War, showcasing her resilience and resourcefulness in challenging circumstances. Throughout the story, Kainene's character explores themes of loyalty, love, and the impact of war on personal relationships. Her interactions with other characters, including Richard and Olanna, highlight the complexities of family dynamics and the struggle for survival during a tumultuous period in Nigerian history.