Amelia Wil Tesla Seyruun is a young priestess and the princess of Seyruun. She longs to be a “hero of justice” and quixotically pursues her quest for justice by following Lina and fighting those who appear to be villains. Amelia’s naïve tendency to believe whatever she is told sometimes leads her to mistake friend and foe. In the novels, Amelia is the same age as Lina, but in the anime and manga franchise, Amelia is a year younger than Lina and smaller (though very busty, much to Lina’s annoyance). Her perspective on good and evil matures significantly as the series progresses. Although Lina is often annoyed with Amelia for her naïveté, her desire to learn the Dragon Slave, and her larger bust size, eventually Lina comes to accept her as a friend and treats her like a little sister.
Most of Amelia’s lessons in justice and heroism came from her father Prince Philionel of Seyruun, the “ultimate pacifist”. After the murder of her mother, Amelia vowed never to use blades, though she once used the Sword of Light to channel the Ra-Tilt. Naga the Serpent is Amelia’s long-lost older sister, the crown princess Gracia. This is played to comedic effect in Slayers Evolution-R, with the amnesiac character “Nama” ironically alluding to the relation. Amelia becomes close friends with everyone in the group, but it is clear that early on she starts to develop feelings for Zelgadis. Their first meeting was not a very good one, but they become quite close as they tend to be paired during missions. Amelia teases him playing chess, or angrily beats him over his maltreatment of innocent forest animals, and gets away without so much as an angry glare.