With consistent representation of characters, are we now on the precipice of a Cambrian explosion of manga/graphic novels/comics?
While this will enable a certain degree of more spam it will more importantly, on the positive side of things, democratize the creative process to those who want to tell a story in images but lack the skill and resources to churn it out traditionally.
Or, if you need solid regions that overlap and mask out other regions, then generate objects over a chroma-keyable flat background.
Transparent Image Layer Diffusion using Latent Transparency