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

Character Traits:
1girl,valpurgis_(the cold blooded warrior),long hair,blonde hair,straight hair,parted bangs,light blue eyes,medium breast,

Clothing & Accessories:

Knight outfit:

[knight armor,gold trim armor,breastplate,pauldron,gauntlet,blue shorts,legs armor,]

Nun outfit:
[black nun outfit,long sleeves,long skirts,black shoes,necklace,]

Nightgown outfit:

[modest nightgown,white nightgown,long sleeves,long nightgown,]

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.

Note: I tried adding the LoRA for Helmet Knight, but it made the images look pretty different than expected, so I left it out of this description.