Frederica is a player in the VRMMORPG NewWorld Online and a member of the Congregation of the Holy Swords guild. She has blond hair tied in a ponytail, red eyes, and a small stature, giving her a catlike appearance.

Highly prideful, especially concerning in-game strength, Frederica idolizes top-ranked players while dismissing the unknown. This attitude leads guild leader Payne to assign her to spy on the Maple Tree guild before the fourth event, wary of her potential bias. During this mission, Sally discovers her and demands a duel. Frederica offers intel on a rival guild regardless of the outcome but strategically surrenders early to hide her combat abilities, inadvertently receiving false information about Sally's skills.

She actively engages in subsequent guild conflicts. During the guild competition, she and Drag defend their base, combining her wide-area attacks with his aggression. Later, she helps corner Sally, believing her exhausted, only for Sally to reveal unexpected power. Maple intervenes, prompting Frederica to order a counter-raid. She supports Holy Swords during a full assault on Maple Tree, using Multi-Acceleration to boost allies and Multi-Full Transfer to strategically combine Dred's and Drag's buffs onto Payne. When Maple activates Atrocity, Frederica attempts retreat, deploying Multi-Wall defensively before defeat.

Her relationship with Maple Tree evolves beyond conflict. After the competition, Maple adds her as a friend and she attends a Maple Tree gathering. A persistent rivalry develops with Sally, leading to repeated duel challenges. During one encounter while Sally levels her access permit, Frederica insists on helping solely to secure a duel. She lands a hit, briefly believing herself victorious, but must acknowledge Sally's continued superiority. Later, leading Holy Swords through the fourth layer, she encounters a separated Maple and allows her to join their group in exchange for defensive support. When the group struggles against a boss, Maple uses Pandemonium I, summoning oni that instantly defeat it, stunning Frederica and her companions.

Frederica later visits Maple Tree specifically to show Sally her new pet, a small yellow bird named Knots. Facing resistance, she secures another duel but is swiftly defeated again. Despite this, she admits finding Sally's reactions endearing and expresses a desire to maintain their rivalry. During the eighth event, Frederica advances through preliminaries and teams up with Sally upon meeting in the main event. They collaborate until regrouping with their guilds, forming a three-guild alliance. Frederica joins Sally, Mii, and Maple to defeat a powerful boss dubbed a "fake Maple," and participates in the collective defeat of the Cthulhu boss.

Her combat style is versatile, leveraging high MP recovery to fulfill offensive, defensive, and support roles. Key active skills include elemental projectile attacks (Multi-Fire Bullets, Multi-Water Bullets), defensive barriers (Multi-Barrier, Multi-Water Wall, Multi-Wall), movement enhancement (Multi-Acceleration), and the buff-transferring Multi-Full Transfer. She also uses vision-blocking Magic Wall. Her passive skill, Multi-Chant, enables efficient multi-spell casting.

Relationships are significant: she shares a close friendship with Drag, often supporting him and trusting his capabilities. She respects Payne as her guild leader. Her rivalry with Sally remains consistent, marked by repeated challenges and a mix of competitiveness and mutual acknowledgment. Her pet Knots serves as a companion.

Frederica shifts from initial arrogance and dismissal of less-known players toward a grudging respect for Maple Tree's strength, particularly Sally's abilities, culminating in cooperative efforts during major events while retaining her competitive drive.