regards,
How many colors should I use in your illustration design?

each character must be separate or be a single unit in the frame ?

There is no minimum or maximum per se. However, i would think we could want some color schemes to reflect the clown soldier's roles. Perhaps, a different or opposite color scheme for officer squad/platoon or battalion leaders from the.infantry.

The can all be in a single frame. However, we would want them to appear individually as well.

thanks a lot for the feedback, I'll start sketching :)