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Culturally informed design for virtual agents has been shown to positively impact health outcomes when tailored to target audiences. We present a participatory design methodology for culturally tailoring virtual agents. Investigators worked with key informants from our target population, members of predominantly Black church communities, to design culturally-relevant and sensitive virtual agent health promotion interventions. In the first participatory session, key informants designed agents to assist them with different aspects of their lives, providing input on agent appearance and agent functionality. In a second design session, participants rewrote the content of a health conversation with an agent, to include personally-relevant content related to their community (e.g., religious and scriptural references). We report design principles for religious tailoring derived from these studies. We conducted a validation study to assess the effects of applying these principles to agents that promoted two health behaviors, finding that participants responded very positively to the tailored agents. CCS CONCEPTS • Human-centered computing → Participatory design; User studies; • Computing methodologies → Intelligent agents.