Frieren

Frieren is the protagonist of Sousou no Frieren and Fern's master. She was the Mage of the Hero Party and traveled alongside Hero Himmel, Warrior Eisen, and Priest Heiter in a 10-year journey to defeat the Demon King. She was a magic prodigy at a young age, with an impressive quantity of mana, which caught the interest of Flamme, a human wizard who taught her everything there is to know about magic and mana control until she passed away. Frieren persists in collecting magic knowledge no matter how trivial it may be.