Origin
Holy Kingdom of Seiryuun
Naga's real full name is Gracia Ul Naga Saillune (白蛇のナーガ), making her the first daughter of Crown Prince Philionel El Di Saillune and the older sister of Amelia Wil Tesla Saillune. Although, Naga is the older sister of Amelia Wil Tesla Saillune, the pair have never met in the series when both were aware of the other's identity. Naga's mother was murdered before her own eyes several years before the start of the series by the famous assassin Booley. As a result, Naga slayed her mother's killer with the crown princess' original spell, Chaos String. After the funeral, Naga found the outrageous outfit she currently wears inside her mother's closet. Shortly afterward, she left home in order to learn the ways of the world. Being a princess, Naga knows when to be graceful, and when to be self-confident. Although she keeps her true identity secret, she acts in a self-confident and sometimes arrogant manner. The only Slayers' character Naga really interacts with is Lina. Naga the Serpent is Lina's rival and companion through the first four movies and both OVAs. She acts as a constant annoyance for Lina due to the fact that she is more, she is a very powerful sorceress, but faints at the sight of blood and is quite clumsy. Throughout their adventures, Naga and Lina often end up on opposing sides and have to fight, but they always end up traveling together again. Nevertheless, the pair will often work together despite their differences, and when they do, they are a great team. Naga is also well-known for having a very distinctive, obnoxious laugh. This trope is known as the "ojou-sama laugh." (Reference for laughter: https://www.youtube.com/watch?v=bbfaF5otJv0)
Slayers
Sorcery Genius Lina Inverse is a redheaded heroine with a hot temper and insatiable appetite for food. She is well known as the "Enemy of all who Live", the Dragon Spooker, Dramatta, and the Bandit killer. She roams from town to town in search of treasure and food. During her travels she acquires a cadre of able, but quarrelsome companions: Gourry, a big, blond, caring, but dumb knight; Zelgadis, a once-human chimera who practices shamanic magic; and Amelia, a justice preaching Princess. Together they make short work of the hordes of bandits, golems, werewolves, trolls, mercenaries, monsters/demons and evil spirits their enemies send after them. Although faced with formidable foes, the crew battles on, whether it be for justice, power, money, a cure, or food.
