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Agency is essential to play. As we design conversational agents for early childhood, how might we increase the child-centeredness of our approaches? Giving children agency and control in choosing their agent representations might contribute to the overall playfulness of our designs. In this study with 33 children ages 4–5 years old, we engaged children in a creative storytelling interaction with conversational agents in stuffed animal embodiments. Young children conversed with the stuffed animal agents to tell stories about their creative play, engaging in question and answer conversation from 2 minutes to 24 minutes. We then interviewed the children about their perceptions of the agent’s voice, and their ideas for agent voices, dialogues, and interactions. From babies to robot daddies, we discover three themes from children’s suggestions: Family Voices, Robot Voices, and Character Voices. Additionally, children desire agents who (1) scaffold creative play in addition to storytelling, (2) foster personal, social, and emotional connections, and (3) support children’s agency and control. Across these themes, we recommend design strategies to support the overall playful child-centeredness of conversational agent design. 

When young children create, they are exploring their emerging skills. And when young children reflect, they are transforming their learning experiences. Yet early childhood play environments often lack toys and tools to scaffold reflection. In this work, we design a stuffed animal robot to converse with young children and prompt creative reflection through open-ended storytelling. We also contribute six design goals for child-robot interaction design. In a hybrid Wizard of Oz study, 33 children ages 4-5 years old across 10 U.S. states engaged in creative play then conversed with a stuffed animal robot to tell a story about their creation. By analyzing children’s story transcripts, we discover four approaches that young children use when responding to the robot’s reflective prompting: Imaginative, Narrative Recall, Process-Oriented, and Descriptive Labeling. Across these approaches, we find that open-ended child-robot interaction can integrate personally meaningful reflective storytelling into diverse creative play practices.