Headbone Interactive was a short lived (founded 1994, releases 1995-1997) Seattle based video game studio that made Shockwave based educational adventure games for CD release. Their games featured an unusual art style that combined monochromatic backgrounds created from composited photographs (a technique deemed “photocollage” by the credits), with flat colored cartoon characters (and interactive elements) on top. Yes! It's a style where the backgrounds elements are supposed to be weirdly joined. Not sure what checkpoint to use for best results. WAI and most popular ones tend to bring the style closer to "normal" a lot of the time, and there's no Autismmix (best for Pony version) equivalent for Illustrious I know of.

Trigger Word: headbone_style
Character prompt: source_cartoon, pixel art, flat color, orange skin,dot eyes, no sclera (swap last two with “black eyes” for Dimension Q style. While orange skin is the default, some tertiary characters with “pale skin” and “dark skin” were trained, as were a few “grey skin” beings from Dimension Q)
Background prompt: dithering, photo background, realistic background, monochrome background, indoors/outdoors (you NEED to specify background elements like a type of place and some objects, even just "Simple Background, white background" for a character alone, or you get a corrupted background. Removing "dithering" from the prompt may make certain background types less corrupted. Outdoors and indoors were fully tagged and seem to make backgrounds much more stable. "Sky" can also help for outdoors)
Weight: monochrome background may need higher weight. 1.5 seems to have worked
Possible Negatives: Ears, realistic, grey skin, robot, off center, in background, distant (these seem less needed for Illustrious version)

Characters:
Elroy series:
Elroy: 1boy, elroy_headbone, brown hair, short hair, Red hat, baseball cap
Bugzerk outfit: yellow shirt, green overall shorts, red shoes, sneakers
Hits the Pavement outfit: backwards hat, orange shirt, striped shirt, dark green shorts, red shoes, sneakers
Sydney DelGado: 1girl, Syd_headbone, flat chest, black hair, bowl cut, hairband, purple hairband
Hits the Pavement outfit: pendant, pink dress, purple tights, brown shoes
Costume Closet intro outfit: magenta tanktop, pink belt, blue jeans, blue shoes,
(As so many images of Elroy and Syd are from Costume Closet, try using “wig” as a negative)
Blue: Blue_Headbone, 1other, dog, blue fur, bloodhound, collar
Costume Closet:
Cecil: 1boy, Cecil_headbone, pale skin, bald, black beret, mustache, monocle, white shirt, long sleeves, sleeve cuffs, teal vest, blue ascot, wristwatch, black pants
Escape from Dimension Q:
Izabel LeGrand: Iz_Headbone, 1girl, flat chest, light blue hair, bob cut, purple shirt, long sleeves under short sleeves, blue sleeves, maroon pants, black boots (may need "Grey Skin" in negatives)
Augustus T. Robot (Auggie): Auggie_Headbone, robot, wheel, yellow eyes, floating head

This LoRA was trained on 173 hand tagged images from the games Elroy Goes Bugzerk, Elroy Hits the Pavement, Elroy’s Costume Closet, and Iz and Auggie Escape From Dimension Q (Headbone’s Gigglebone Gang series features a different artstyle by different artists and was not used for training). I am aware of the pilot for Elroy: The Animated Series, but the only surviving copy has heavy compression artifacts unsuitable for a pixelart LoRA (also Elroy with sclera is kinda creepy). I didn’t have the downloadable costumes for Costume Closet (and don’t know if they even exist anymore, please tell me if they do) and thus they aren’t in the training.

Try specifying colors for foreground objects. The nameless mobsters of hit the pavement gave ample training data for “stubble”. Most characters in training data had four fingers (3+thumb), so that’s not a defect, it’s a feature.

Illustrious changes: Did a second pass for tagging, adding a lot of missing stuff, deleted a few pictures that were overly duplicate.