PaperBanana is an AI-based figure-generation tool tailored for researchers. It accepts natural-language descriptions or uploaded sketches and produces methodological diagrams, system architectures, statistical plots, and educational infographics. A multi-agent architecture translates text into structured layouts and renders visuals with a dedicated model, while statistical plots are produced as executable Matplotlib code to guarantee numeric accuracy. Advanced mode can ingest articles to recover visual styles and refine aesthetics to publication standards.