Yuri had a knight she admired, while having great determination.
She saw herself in Knight-chan.
Yuri has a remarkable potential for magic.
Perhaps that played a part in her blood arts.
Yuri had a spell cast on her during her days of capture.
She stifles a pleasure response when her blood is sucked – much, much later on.
She is a vampire with a hatred towards "her own kind" "the ones that turned her into it". Hence, her journey of vengeance that may have ironically labeled her as a harbinger of calamity.
This chapter made a lot of details about Yuri make more sense now. But holy fuck I am in pain. This is definitely my second favorite chapter so far 😭🍜