Since I haven't seen a Serana LoRA for Anima, I decided to share my own.

Character tags:
Serana, double crown braid, short hair, yellow eyes, black hair,

You can also try different eye colors, and for more of a vampire look, try using black sclera. You may need to add slit eyes to the negative/positive prompts if you notice the eyes looking a bit off.

Armor / Clothing:
vampire armor, gorget, belt, vambraces, cape, black hooded cloak, cape pin, pants, red skirt, two-sided cape

Cape Pin:
Do note that getting Serana's cape pin rendered correctly can be difficult. I recommend using inpainting (only masked works best) with a prompt focused specifically on the cape pin and black cape. It's a fairly complex design, so I find that trying to get it correct on the first pass with txt2img can be unreliable. Inpainting is my preferred method for fixing it.