Arena Google Gemini was an immersive activation at CCXP that transformed participants into personalized digital characters for a card battle. We designed and developed the interfaces for four integrated stations. This experience collected player data such as name, attributes, objects, and background, and sent this information to a central system powered by Nano Banana, Google's image-generating Artificial Intelligence. This process synthesized information into character cards printed on the spot and later used for battles between visitors.