Building NousyBooks: How I Used 6 Gemini Models to Create Personalized Children's Storybooks

Their face. Their story. Their book. Every parent knows the magic of a bedtime story. But what if the hero looked exactly like your child? As a parent of a 7-year-old daughter, I've spent years exploring children's books with her — from Usborne's lift-the-flap books to interactive ebook apps. One thing became clear: children light up most when the story feels like theirs . Not a generic hero — them . Existing personalized book services cost $50-100+, take weeks to deliver, and use crude template swaps. The result feels manufactured, not magical. Then Google released Nano Banana 2 ( gemini-3.1-flash-image-preview ) with character consistency — the ability to maintain a person's likeness across multiple generated images using reference photos. The idea clicked instantly. I could build a tool where a child's actual face appears on every page, in any art style, generated in minutes. That's how NousyBooks was born. Try it live: https://nousybooks-hackathon-218423701961.us-central1.run.app S