Sersi Eien is a key character in the anime series 'Eien no Monogatari.' She is portrayed as a mysterious and powerful figure, possessing the ability to manipulate time and space. Her enigmatic nature often leaves those around her in awe and sometimes wary. Sersi plays a crucial role in the unfolding events of the series, often guiding the protagonists with her vast knowledge and wisdom. Her presence is pivotal in the battle against dark forces seeking to disrupt the balance of the universe, making her an indispensable ally in this epic tale.