This page serves to catalogue interesting tags for image generation, which can lead to useful behavior, or have unusual effects that can be exploited reliably.
Tags and Tag Combos
prismatic
Leads to gem-like and colorful elements. Can be combined with specific objects or facial features. Is rather strong, so it is better used with some weakening.
freckled skin
V1: Much more reliable and artifact-free freckles. Generally subtle, cheeks/shoulders. V2: use freckled body instead.
braces + fangs / sharp teeth / razor teeth
V1: Generally leads to more detailed sharp teeth that are more consistently shaped. V2: Unnecessary. Fangs generates sharp canines, sharp teeth generates seesaw teeth as expected.
rigid teeth
V1: "Cringing" or gritting teeth. Without facial expression, generally has a note of disgust/disappointment. V2: Makes the character yawn (slightly squinted eyes and open mouth with teeth above and below), better than then yawning tag.
lion hair
Very voluminous and wild hair like you'd expect out of a lion girl's mane. Animal ears will tend to generate, so put them in UC if you don't want them. V2: Lion girl tends to generate that kind of hair by default.
shaped pupils
Usually leads to white/light colored pupils with dense iris detail. V2: Mostly makes pupils white, and sometimes shapes them like hearts, or slits.
X-Y-Z-hair
Can be used for tri-tone hair. Order is not always respected, and it generally goes from tips to roots.
Detailed Skin
V1: As opposed to "Detailed" which often damages quality by itself, this can lead to faces with greater texturing and more fancy-looking eyes. Tends to give lipstick to characters, so Lipstick can be put in UC. V2: Affects the general texturing, and has a stronger effect on outfits than skin. Tends to change facial anatomy quite strongly.
white inner eye
V2: brightens irises. Combine with empty eyes to create irises that are bright and flat colored.
Magic UCs
petite, loli, toddler
Severely reduced youthfulness for all. Should always be used when generating anyone adult-looking.
幼児化
Infantilization in Japanese. Adds maturity to the subject. V2: less effective. V3: No effect.
claw
Tends to improve hand anatomy by reducing sharp angles.
tears
Reduces eye artifacts when using tags like colored eyelashes, eyeliner, eyeshadow v2: Not necessary.
sanpaku
Seems to break away from "NAIDiffusion style" with default quality tags. More detailed eyes. V2: Increases iris size as expected, but no other notable effect.
jpeg artifacts
Already in default UC but worth reinforcing when using very low scale and more painterly styles like watercolor, ink sketch
red eyeliner, red eyeshadow
V2: Eyeliner and Eyeshadow tend to create red outlines around the eyes of characters. If you want thick eyelashes, try mascara
chromatic aberration
Improves outline clarity and reduces color artifacting around them. Already in the default UC in Heavy and Human Focus (V3 only) presets.
genshin impact
V2: Strongly interferes with some prompts, it may be worth using if you feel the style is stilted with your current prompt.