Putting "source_furry, source_pony, sketch, painting, monochrome, 3d, realistic" in negative prompt helps achieve a more anime style.
Basic prompts : 1girl, katarina, red hair, long hair, green eyes, scar across eye
Outfit prompts : cropped jacket, armor, belt, black pants, cleavage, fingerless gloves, midriff, navel, tattoo, boots
Weapon prompts (random) : knife, dagger, dual wielding