Midjourney's "consistent style" feature is called "Style Reference." By inputting "--sref xxx", you can generate images with a specific fixed style. This feature allows users to specify their desired visual style by providing either an image URL or a style code (sref), enabling the AI to generate images that better match an expected artistic style, achieving style transfer and control.
However, there are approximately 4 billion sref codes, and their quality varies significantly. I created a website that collects sref codes and categorizes them by style, making it easier for AI designers to choose and use them.