Pedagogical Conversational Agents (PCAs) such as chatbots and voice assistants can be used to help learners study through intelligent dialog. For example, educators can use PCAs to facilitate creative brainstorming processes. PCAs as brainstorming facilitators allow learning groups to network with each other and generate or evaluate ideas with the support of the PCA. There is still a lack of implementations and studies on PCAs for creativity support in 3D-based virtual worlds in the literature, although they offer many potentials, such as higher immersion. In this paper, we present a Unity-based virtual world for brainstorming accompanied by two PCAs. Our paper aims to guide developers and educators on deploying PCAs in virtual worlds, and we strive to expand the knowledge base in this area.