This study examined how 44 preservice teachers reflected on their teacher self-identities through exploring multicultural children's books, which are published in different time periods, with a focus of analyzing characterization of main characters. The researcher collected data, including a multicultural book project, pre- and post-surveys on multicultural children's literature and teacher identities, and a reflection paper. Data analysis consisted of looking for and coding emergent themes. The findings of the study showed that preservice teachers analyzed multicultural books from authentic perspectives, focused on how the authors used appropriate language, and examined trends in cultural details and illustrations published in different time periods. They analyzed characteristics of main characters by parsing the facts, by examining the context of the story, and by examining the personalities of main characters. They also refined their teacher identities and strengthened their commitment to become culturally responsive teachers by reflecting on the importance of equity, diversity, and inclusion and embedding high-quality multicultural children's books into the curriculum. Implications and recommendations are also shared.