I've been generating a lot of robot images lately, themed around their color accents. I'm still in the process of finding out what I like, so nothing is set in stone, but here is some preliminary information on my concept for those interested in what the colors mean.
https://civitai.com/collections/9823122
Red - Assassins, torturers, hunter/killers
Creepy, glowing eyes, cracked shells, horrific smiles, headtilt, red webbing, contortionist, dangerous, horror, one eye, many eyes. Yandere, unstable, psychotic.
https://civitai.com/collections/9823124
Blue - Navigators, information processors, databases, hackers
Transparent, data streams, cables, tubes/cells/chambers, smart haircuts or flowing/floating hair, circuitry. Intelligent, sassy, helpful.
https://civitai.com/collections/9823139
Green - Pilots
Greens are the fearless pilots who defy all odds to save the day or die trying. They spend their off-time drinking, fighting, gambling, and fucking.
Visual Cues: Short or punk-styled hair. Flight jackets. Wild grins and cocky smirks. Han Solo-ish pants and belts, as well as small weaponry like pistols/blasters.
Themes: Tomboys, punks, gunslinging, daredevilry, cockpits/spaceships, sexual assertiveness.
https://civitai.com/collections/9868999
Orange - Engineers/Repair
"Fit" frame, toolbelt or backpack? Shirt tied around waist? Extra arms? Tank top or vest, loose pants, workboots. Hat? Integrated goggles. Red/orange hair. Stripe or block patterns.
Tsundere, overworked, annoyed.
https://civitai.com/collections/9940145
Yellow - Explorers, Surveyors, Cartographers
Faceless/inhuman helmet, visor, cape or backpack, pouches and belt
Visual Cues: Head is often a featureless visor or heavily mechanical in appearance, containing dozens of different types of sensors.
Themes: Beautiful environments, unsettling environments, wonder, danger, peril/hopelessness
https://civitai.com/collections/9823161
Pink - Pleasure bots, companion bots, advertising
Visual Cues: Excessive curves are common, comparable only to the more heavily-modified of humans. Elastic materials such as latex and silicone typically make up these curves, and may coat other areas of the body as well.
Bimbo, curvy, long hair, big hair, excess. Bubbly, adaptable, flirtatious.
https://civitai.com/collections/9823119
Purple - Ambassadors, diplomats, envoys
Regal, capes, high collars, stunning dresses, tall, thin, long hair. Geometric/hex patterns. Serious, composed, scheming.
https://civitai.com/collections/9823530
White/Gold - Healers, guardians?
Visual Cues: Angelic in appearance with features like wings and a halo. Some are more "biblically-accurate angels" with bizarre features but they're still meant to be attractive rather than horrific. Their bodies are often clockwork/steampunk in nature, with ornate designs and glass casings. They look fragile but are extremely durable. Some carry large tower shields and others make use of forcefield technology.
Motherly, w/thick thighs
https://civitai.com/collections/9860589
Gold/Red - Couriers, Delivery
Skinny, long legs, motion lines, ponytail, backwards hat, huge backpack, shorts, croptop, midriff, thigh pouch. Energetic, cheerful, personable.
Unassigned: Natural Scientists, Soldiers (brash, physically imposing, 'muscle mommy'), Spies/Infiltrators, Security, Entertainers