The titular protagonist of Sousou no Frieren.
She is the Mage of the Hero Party and traveled alongside Hero Himmel, Warrior Eisen, and Priest Heiter in a ten-year journey to defeat the Demon King.
Several years later, she took on another journey with Warrior Stark and her new disciple Mage Fern, eventually reunited with her now elderly former party members. She is often known as "Frieren the Undertaker" (the title of the series) due to her being the Mage who has killed the most demons in history, even managed to kill the Demon King multiple times whenever he was revived. Frieren's hatred of demons is due to her being the last elf who survived the genocidal attack by the demons from thousands year ago.
Frieren is a petite female elf with green eyes and long white hair tied into twintails with parted bangs. Like all Elves, she has large, pointy ears. Despite her youthful appearance, she is over 1,000 years old in age.
She wears a striped black and white shirt, along with a white jacket with gold embellishments tucked into a matching white skirt with a black belt. Over her jacket, she wears a white gold-trimmed capelet with a red gemstone on her high collar. She also wears black pantyhose and brown boots, and a pair of gold and red earrings on each ear. She also carries a mage staff.
In the past, she had her hair hair down and wore a simple white dress.
In the anime, she's voiced by Tanezaki Atsumi in Japanese and Mallorie Rodak in English.