Gūko operates as an underling to Count Ludwig Presto Von Meinstein Collection, known as Prince Eccentro, within the Collection team. Her air-headed yet friendly demeanor contrasts sharply with Batch, her more committed and brash teammate. Physically, she is characterized as big-breasted.

She consistently evades punishment from Chuzaemon Takenaka, also called Tanaka, during mission failures while others face consequences. A notable degree of luck ensures she frequently escapes injury when others are harmed. During Prince Eccentro’s launch sequences, she habitually poses lengthy, logic-based questions, prompting Eccentro and Batch to dismiss her with "Never mind, Gluko" out of boredom.

Gūko carries a book detailing Mon World and its creatures, consulting it for reference. Later, she adopts a Forest Imp named Impy. In the Japanese version, she maintains polite and respectful speech patterns consistently, addressing both allies and adversaries with formality.