Gertrude is a female Elf with a white skin and brown hair. Like all Elves, she has black stick-like legs and arms. She is dressed in a blue dress with a red sash, and wears a pointy hat.
Gertrude is a member of the Delegation for the Return of Wayward Elves. She is only a minor character; she has no dialogue, and remains in the background for most of the episode.
Along with the rest of the delegation, she is send to Trolberg to pick up Alfur, who has been replaced by Alvin as the Northern Counties' correspondent in the city because the Elf Prime Minister and his cabinet believe Alfur's reports about his adventures in Trolberg to be false. To prevent Alfur from having to leave, Hilda comes up with a plan to trick the delegation. They ask the Bragga Family for help, and Agnes volunteers to disguise herself as Alfur. The delegation falls for it, but Agnes can't keep up the appearances for long and quickly loses her temper. Alfur is forced to reveal himself to prevent the situation from escalating.
When Alfur tries to escape from the Delegation, Gertrude and the rest of the delegation chase after him. The chase takes the Elves to the Farmers Market. There, the Elves are mistaken by the locals, who can't see them, for spirits, and are eventually captured by Gerda Gustav when they enter a lighthouse decoration. Alvin and Alfur are the only elves not captured since they jumped out of the lighthouse in time. Along with the other captured Elves, Gertrude is brought to Safety Patrol HQ by Gerda, where she attempts to interrogate them. Alfur rescues the group by tricking Gerda into believing he is a member of the Spirit Safety Patrol, so she releases the captured "spirits" into his custody. At the end of the episode, Gertrude leaves Trolberg again with the other members of the Delegation.