Blueavatars’ VirtualZeus is a prototype mobile application of an HCI for a chatbot, where the user can ask questions to a virtual character from the Greek mythology, incarnated through the combination of computer animation and augmented reality with spoken natural language processing and generation. The ancient god Zeus has been chosen as a testbed for the four aspects of the project’s implementation that is visualization, verbal interaction, information retrieval, natural language generation. The modules in the AI tier of the architecture use ASR and TTS models provided by Microsoft Azure, and a locally deployed LLM capable of robust English and Greek generation. This requirement is satisfied by Llama Krikri, a lightweight model that was created by ISLP by fine-tuning Meta’s Llama 3.1 8B on Greek corpora. The prototype is an Android application, which uses the ARCore component in Unity to project the face of Zeus in the environment that is captured by the device camera. A user can prompt the LLM by speaking to the microphone and hearing the response while the face of Zeus is animated, and the text is typed on a bubble. The virtual persona was designed through extensive prompt engineering, where a role was specified and guided with a list of additional instructions. The RAG system has a collection of documents on Greek mythology that are composed by human experts, and contain information like names, relationships, genealogy, places and events, mostly from the works of Hesiod and Homer. A limited evaluation of the system revealed that most of the users prefer the HCI demonstrated by VirtualZeus that resembles the natural dialog between humans, instead of a text-based chatbot UX. Additionally, 78% of the users found the answers given on Greek mythology accurate.