Doppel Luka & Variants (Luka Holly, Luka Rinoa, Luka Heine, Luka Kirie) from Monster Girl Quest

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Luka Holly/Doppel Luka (1st Image):

Doppel, purple hair, short hair, low twintails, hair between eyes, blue eyes, pointy ears, red cape, brown vest, beige shirt, long sleeves, belt, black_shorts, bike_shorts, gloves,

Luka Rinoa (2nd Image):

Doppel, purple hair, long hair, hair between eyes, blue eyes, pointy ears, medium breasts, red cape, brown vest, beige shirt, long sleeves, belt, gloves, brown dress,

Luka Heine (3rd Image):

Doppel, purple hair, short hair, low twintails, hair between eyes, blue eyes, pointy ears, fang, armor, bikini armor, brown_gloves, navel, bike shorts, boots, shoulder_armor, pauldrons, crotch_armor,

Luka Kirie (4th Image):
Doppel, purple hair, long hair, hair between eyes, blue eyes, pointy ears, wings, fairy_wings, medium breasts, gloves, boots, fingerless gloves, long_gloves, armor, armored_boots, blue_leotard, knee_boots, cleavage, (neckline), exposed neck, shoulder_armor, bare_shoulders,

Civitai: https://civitai.com/models/1355880/doppel-luka-and-variants-luka-holly-luka-rinoa-luka-heine-luka-kirie-monster-girl-questmonmusu-quest-illustrious