This content originally appeared on DEV Community and was authored by Veronika
This post is my submission for DEV Education Track: Build Apps with Google AI Studio.
What I Built
For this project, I built the "Martian RPG Character Portrait Generator", a web app designed to create unique characters for sci-fi tabletop role-playing games set on Mars.
The app utilizes Google's multimodal AI capabilities, using the Imagen API to generate visually striking character portraits and the Gemini API to create rich backstories, personality traits, and game stats. The goal was to create a tool that could instantly provide inspiration for both game masters and players.
Here is the core prompt I used in Google AI Studio to generate the application:
Please create a web app called Martian RPG Character Portrait Generator.
The app should allow the user to generate a unique RPG character portrait set in a sci-fi world inspired by space exploration and Mars colonization.Key requirements:
Use the Imagen API to generate highly detailed, visually striking portraits of RPG characters (explorers, scientists, space pirates, engineers, alien beings, Martian settlers).
Portraits should reflect a futuristic, Mars-themed setting (space suits, domes, alien landscapes, red dust, cybernetic implants, etc.).
Allow the user to input a character archetype (e.g., ‘Martian Explorer’, ‘Alien Diplomat’, ‘Space Pirate Captain’) and optional style modifiers (e.g., ‘retro-futurism’, ‘cyberpunk’, ‘comic book style’).
Use Gemini to generate a short character backstory, role-playing stats, and personality traits based on the chosen archetype and style.
Display the generated portrait and the accompanying character description together in a clean, card-style layout.
Include a “Generate Again” button to allow users to refresh both the portrait and description.
While the image and text are generating, display a loading indicator.
If the Imagen API fails to generate an image, display a placeholder image and a friendly error message.
The app should integrate image generation (Imagen) and text generation (Gemini), have a simple and user-friendly interface, and be ready for deployment as a small web application.
Demo
You can try the live application here:
Try the Martian RPG Generator!
Here's a screenshot of a generated character:
My Experience
What amazed me most was how quickly an idea turned into a working web app with Google AI Studio — it felt like going from zero to warp speed. The AI didn’t just make a tool; it captured the exact sci-fi, Mars-colony vibe I imagined, from the portraits to the UI.
This was a great crash course in prompt engineering: the clearer the instructions — dividing tasks between Imagen and Gemini, even suggesting UI layouts — the better the results. It really showed me how powerful it is to translate vision into prompts.
This content originally appeared on DEV Community and was authored by Veronika
Veronika | Sciencx (2025-09-10T10:55:54+00:00) From Prompt to Planet: A Martian RPG Generator. Retrieved from https://www.scien.cx/2025/09/10/from-prompt-to-planet-a-martian-rpg-generator/
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