The Moon Moon twins. Sarasa sort of runs the country? And Rasara is, like, skeptical? The concept of a colony that rejects technology and Gundams is interesting, but the execution is pretty goofy a la ZZ Gundam.
A good amount of the training images feature other characters. You might need to specify solo or negative prompt out any additional people.
My advice for putting them in the same scene is to use regional prompts or inpaint after doing a non-regional prompted generation. Illustrious will otherwise blend features together.