What should I use for handwritten newspaper? Crayons? Gouache? A marker? Or other stationery?

Actually, it doesn't matter what you use See what you are good at. Crayons get dirty easily. The water content of gouache should be controlled, otherwise it will be too light or difficult to dry. If there is mixed color, look at your own level. It is easy to mix with other colors when it is not dry. Watercolor is more convenient, but if the scope of painting is large, you should prepare enough pens, otherwise it will be easy to lack water, and it is best to draw evenly at one time, otherwise adding one more layer of color will be different or cause paper damage.