In November 2021, Riot Baby, written by the Nigerian American author Tochi Onyebochi, was The World Fantasy Awards winner of the best novella published in 2020. Blending fantasy with real history, the story is about two black siblings, Ella and Kevin, who are gifted with supernatural powers. Kevin, the riot baby of the title, was born at the beginning of the Los Angeles uprising in 1992. Kevin was incarcerated for no reason but his color, and his sister visited him both in person and via using her magical powers. The story mainly revolves around Kevin, his sister’s endeavors to protect him and the siblings’ attempts to survive in an American society that hates them for being black. The story is loaded with Black American anger, racism, grief and sibling love. A mixture between reality and sci-fi fantasy, the novella is analyzed so that the rich cosmoses of the text, its real and possible worlds and the characters’ mental states can be detected. Because fiction often explores and presents important social realities, this research seeks to analyze what is communicated in Riot Baby so that the role played by this fiction in addressing racism may be illuminated. The model of analysis, inspired by the major contributions of PWT forerunners, such as Ryan, Pavel, Eco and Stockwell, is original. Being inter-disciplinary, it draws on the disciplines of psychology, via Theory of Mind (ToM), philosophy, via Possible Worlds Theory (PWT), and presumably this also counts as a stylistic analysis. The results present the characters’ mental states and the rich worlds they progress through.