Lillya Elora, (the wandering lady knight.)

Lillya Elora is a 25-year-old French immortal knight. She fought alongside "Jeanne D'Arc", during the 'Hundred Years' War' in 1429, until she met her fateful end on the battlefield when monsters invaded Europe. Just before her death, Lillya was saved by the Norse goddess Freya, who saw in her a worthy champion for the realms. She was transported (Isekai) to the Nine Realms of Yggdrasil, received a golden apple from Idun granting her immunity to aging, and was given a cat companion named Yula, a lucky cat from Freya. Now she wanders the Nine Realms, driven by a heart for justice, and a quest for righteousness with the morality memory off her best friend, Jeanne D'Arc.