Based on the WonderSwan Color version.

No grid is needed this time. It should be easy to import the results into Aseprite or your preferred software, and downsize them using nearest-neighbour interpolation:

These were generated with WAI-NSFW-illustrious-SDXL (v9 or v14 work best).

Recommended settings
Aspect ratio: 1024x1024 for most enemies, 832x1216 for tall enemies (ala Sandy, Golbez, Armored Fiend, etc.,)
Weight: 1.0

Sampler: Euler a

Steps: 20 or higher

CFG Scale: 5

Tags: masterpiece, best quality, amazing quality, very aesthetic, absurdres, newest, ENEFI, pixel art, simple background, full body, solo

Optional: no humans, dark eyes, no sclera, chibi, big eyes, big head,

Negative prompt: lowres,(bad quality,worst quality:1.2),bad anatomy,sketch,jpeg artifacts,ugly, poorly drawn,(censor),blurry,(watermark,signature,text:1.3), malformed hands