The character is Margareta from manhwa The Cold-Blooded Warrior.

Character Traits:
1girl,margareta_(the cold blooded warrior),blue hair,long hair,straight hair and slight curls at ends hair,bangs hair,long sidelocks,golden eye,cross pupils,small breast,

Clothing & Accessories:
black nun,nun outfit,nun veil,long sleeves,white trim clothes,blue gemstone necklace,black stockings,

Usage Note:
For best results, apply a weight between 0.7 – 1.0 to maintain character consistency and For weight between 0.8 – 1.0 to maintain clothes consistency.

Some clothing elements may not exactly match the reference images, but the differences are only minor.