Mokona Modoki, specifically the black variant known as Larg, is a supernatural creature crafted by the witch Yūko Ichihara and the wizard Clow Reed. Its design draws inspiration from the original Mokona encountered in the dimension of Cephiro during their interdimensional travels. Created alongside its white counterpart Soel, Larg serves specific functions within its masters' intricate plans, notably facilitating communication across dimensions and aiding the Tsubasa group's quest. The name "Mokona Modoki" incorporates "Modoki," signifying "pseudo" or "imitation," reflecting its status as a creation inspired by the original. Larg sports black fur, a rabbit-like appearance, a blue gem on its forehead, and a matching blue earring. This earring acts as a potent magical seal, suppressing or containing magical energies. It specifically seals significant memories, including those of Sakura from *Tsubasa: Reservoir Chronicle* and Kimihiro Watanuki's past. Larg's abilities encompass seeing and devouring spirits, compressing them into spheres, and teleporting objects via interdimensional transfer to Soel by swallowing them. It also commands 108 secret techniques, ranging from voice imitation and clairvoyance to time travel and immunity to misfortune. Unlike Soel, Larg specializes in spiritual perception and magical suppression but cannot travel between dimensions itself. Personality-wise, Larg shares Yūko's fondness for alcohol, acting as her drinking companion. It exhibits a teasing demeanor, particularly towards Watanuki, often provoking reactions mirroring Soel's interactions with Kurogane. Larg communicates formally and takes offense at indirect or rude Japanese references, insisting on respectful address. Following Yūko's death, Larg remains within her wish-granting shop alongside Watanuki, the new shopkeeper. While Yūko's twin attendants, Maru and Moro, grow closer to Watanuki, Larg maintains its established dynamic with him. It continues assisting with the shop's supernatural operations. In the OVA *Rō Adayume*, Larg facilitates communication between Yūko and the Tsubasa group, relaying messages and transporting objects like a key for Syaoran and Sakura during an incident in a mysterious mansion, showcasing its role in sustaining cross-dimensional connections forged by its creators. Larg's narrative spans multiple media, including manga, anime series, and OVAs like *xxxHOLiC: Shunmuki*, *xxxHOLiC: Rei*, and *Manatsu no Yoru no Yume*. Its origins and adventures are further chronicled in the spin-off book *Soel to Larg: Mokona=Modoki no Bouken*. Across all appearances, Larg acts as a vital bridge between *xxxHOLiC* and *Tsubasa: Reservoir Chronicle*, underpinning the intertwined destinies of characters across both series.