Chibimaru-chan, called Penelope in English adaptations, is a young hamster character in the Hamtaro franchise. She stands as the youngest member of the Ham-Ham group, owned by the human Kylie. Her signature trait is her near-constant wearing of a yellow blanket draped over her head and body; she appears without it only rarely. These brief blanket-free moments occur in the English dub's opening, select merchandise like the Hamtaro Origami book, and a split-second scene in the episode "Jingle, the Wanderer." Her communication reflects her extreme youth and innocence. She primarily expresses herself through sounds: "Ukyu" (うきゅ) in Japanese, and "Ookwee" or "Ookyoo" in English dubs. The later English shift to "Ookwee" replaced "Ookyoo" due to potential concerns. Movement sometimes involves other sounds like "badda-badda" or "ticky-ticky," possibly dub variations. Despite her limited sounds, other Ham-Hams, especially Pashmina, often grasp her meaning. Her personality centers on childlike naivete and unintentional troublemaking. She shares a deeply attached, sister-like bond with Pashmina, who acts as her primary caregiver and interpreter. Episodes like "Watching Over Cute Penelope" and "Knitting, Knitting Barrette!" highlight her distress when separated from Pashmina or when Pashmina focuses elsewhere. In "Dream Watcher! Penelope," she misconstrues Pashmina's actions through her immature lens. Beyond this core relationship, she befriends Marron in "Marron's Autumn Festival," aiding him during a festival problem. Their friendship is noted as significant, partly due to similar size and age, with Marron among the few understanding Penelope’s sounds. Her role remains largely static as innocence embodied, though later seasons show fleeting crushes hinting at curiosity beyond the group. These include affections toward Herbert the Pig, a boy named Ethan (Kylie’s cousin), and a rabbit at Ethan’s school. Contradictory background details exist. The manga *Tottoko Hamutaro: Hamuchanzu de Gozaimachu! Vol.1* identifies her as Bijou’s younger sister, while other sources like the game *Hamtaro: Ham-Hams Unite!* describe her as Pashmina’s sister. The *Tottoko Hamutaro Anime Dechu* OVA refers to her as "Chibimaru-kun" (a suffix typically masculine but sometimes used for young children). Visually, she has brown-and-white fur under her blanket; early merchandise occasionally depicted a nose on the blanket itself, a detail absent in the anime.