In the classic Madhouse Studios style (with Yutaka Minowa character designs) from the 1993 film Ninja Scroll.

Trained on PonyXL
Weight around 0.1-0.7/8 --lower the weight even more if it's too much

Characters: Not trained on names.

Add brown/black/yellow eyes and eyelashes in the prompt for more accuracy.

Jūbei - (1boy, solo, male focus, dark skin, brown eyes, eyelashes, lips (neg-red lips), manly, brown hair, messy hair, long hair, long bangs, ponytail, Japanese clothes, holding weapon, holding sword, katana, glaring, serious, frown, rice hat, split rice hat, samurai, fighting stance, battle, open mouth, teeth, clenched teeth (Include: 'perfect teeth' - if need be)

Kagerō - (1girl, black hair, short hair, straight hair, parted bangs, eyelashes, brown eyes (or) black eyes, red lips (or) lipstick, purple headband, forehead jewel, ninja, gloves, fingerless gloves, short kimono, knife, pale skin, loose hair strand)

Genma - (black hair, short hair, straight hair, long sideburns, pixie cut, bangs, eyelashes, black eyes, manly, muscular, pectorals, thick arms (possibly), glaring, chin, serious., smile, smirk, dark skin. Possibly more accuracy for him with prompt -> Red theme.

Tessai - Stone Man - (rock, bald, cracked skin (you could also try stone skin or rock skin), manly, muscular, (note: male focus may turn him into Jubei) Benisato -Snake

Woman- (black hair, long hair, straight hair, nihongami, half updo, loose hair strand, eyelashes, yellow eyes, arched bangs, red lips (or) lipstick, smile, kimono, fingernails, nude, bare shoulders, snake, pale skin) Extra: Dragon (helps produce the snake sometimes), tentacles (mostly cursed though).

Other characters may appear but less so. Might also be able to get...

Dakuan - (old, old man, straw hat, rice hat, hakama, haori, staff)

Mujūrō Utsutsu - Blind Samurai - (eyelashes, closed eyes, black hair, long hair, straight hair, arched bangs, haori, hakama, hakama skirt, holding sword, katana, bamboo forest)

LANDSCAPES: No humans, scenery, indoors, outdoors, grass, valley, snow, desert, moon, building, architecture, east asian architecture, water (also include: Inverted reflection), sky, cloud, bloom (can help for the overall style), fireflies, field, flowers, tree, waterfall, plant, star (sky), wooden floor, mountain, fantasy setting, landscape, etc.

MONSTERS: Monster/Tentacles/Snake/Scales - (2m Karras works pretty well for them) and can make some pretty cursed looking stuff since it's not really trained on any monsters; Just the snakes crawling on Jubei/snake woman, etc.

Blue, Red or Green theme for a possible base (not completely necessary but may help) - (Trained more on blue theme)

blue theme - Night, Night Sky, Dark --

^ And for a better chance at lightning effect: Electricity, bloom, Monochrome (and/or 'spot color')

green theme- Bamboo Forest, Kagero, Jubei, hetero, (or -- 'couple, hug, resisting, forced, molestation')

red theme- Building, Burning, (Fire, Flames, Blaze -- not in the prompts though and Jubei/Genma may show up)

NEGATIVE:

sepia

high contrast

scar

headband

forehead jewel

nihongami (<- geisha hairstyle)

chronmage (<-samurai hairstyle)

monochrome

nude

naked

nipples

realistic

hetero

blood

blood on face

rice on face

pillarboxed

anime coloring

broken

topless -- (female characters like to generate nude sometimes)

painting/oil painting -- (if it's too 'messy')

muscular pectorals

open clothes

open kimono

thick/buff -- (if the males are too beefy)

2girls

2boy/3boys/6boys/Multiple boys

malformed sword

weapon

katana

facial mark

2000s style

black border

white border

NINJASCROLL (PonyXL) - 15