Not much is known about her, other than that she is considered to be one of the most fearsome warriors of the Bragga. She rides a rabbit in battle and fights with a wooden spear.
In the animated series, she never speaks. She only roars in anger (usually followed by her spitting and breaking her spear in half), or grunts. She does have dialogue in the novelization.
In "Chapter 7: The Lost Clan", Alfur was threatened with having to fight her to end the old conflict between the Bragga and Aldric Family, but Frida interfered in time and the fight never happened. During the festivities at the end of the episode, Agnes was seen jousting against another rabbit warrior. She easily won.
In "Chapter 6: The Old Bells of Trolberg", Agnes participates in the Bragga's attack on the central belltower to prevent Erik Ahlberg from activating his mechanical bellringers. They manage to distract the Trolberg Safety Patrol officers so Hilda and Frida can sneak into the tower.
In "Chapter 12: The Replacement", when the Delegation for the Return of Wayward Elves comes to get Alfur, Agnes volunteers to disguise herself as him and take his place. While she is clearly not the best choice for the job, nobody dares to say no to her. Agnes quickly blows her cover however when presented with paperwork by the delegation, and violently attacks them, forcing Alfur to reveal himself. Later, Agnes, along with Bartell and the Delegation, get captured by Gerda Gustav, who mistook them for spirits disturbing the Farmers Market. Alfur was able to free them by tricking Gerda in to releasing these rogue spirits into his custody.
- Like the rest of the Bragga, she is exclusive to the animated series and the novelization, and does not appear in the graphic novels.
- In "Hilda and the Great Parade", her age is stated to be 92. The animated series does not mention her age.