The character is Black Fortress like literally name of Black Fortress from manhwa Valhalla Saga.

Character Traits:
1girl,black fortress_(Valhalla Saga),blue hair,long hair,hair over one eye,side bangs,blue eyes,,small breast,

Clothing & Accessories:
hairpin,bodysuit,bodystocking,white transparent scarf,

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.