“From police officer to vampire — a girl becoming a monster while holding on to her humanity.”
A massive weapon no human could carry. Using it is the most visible demonstration of her vampiric strength.
Vampiric regeneration from near-fatal wounds. Her recovery rate and potency increase significantly in the later arcs.
By finally drinking blood, she awakens as a full vampire. Her combat power surges dramatically — it arrives at the story's climax.
Even as a vampire, she holds onto the desire to remain human. She doesn't shrink from fear, but she doesn't enjoy cruelty either. She grows in her own way, balancing duty and empathy. Her final awakening is portrayed not as a power gain but as a choice to protect the human bonds she has formed.