Filburt Shellbach is a fictional character from the animated television series Rocko's Modern Life. He is a turtle who is known for his neurotic personality and his obsession with cleanliness. Filburt often finds himself in humorous situations due to his anxious nature and his interactions with other characters. In the show, Filburt is best friends with Rocko, the main character, and Heffer Wolfe, a lovable but dim-witted steer. His character adds a unique dynamic to the series, providing comic relief and relatable moments for viewers who may struggle with anxiety or perfectionism.