Lum Cheng is a character from the anime and manga series Silent Möbius. She is the granddaughter of the powerful magician Avalanche Wong and hails from Neo Clone in Hong Kong. Lum Cheng becomes the wielder of the Imperial Sword Gesso, a sentient blade considered the equal of the sword Grospoliner, though Gesso appears less intelligent. She also practices elemental magic, able to command fire, water, and other natural forces, and is described by her grandfather as a feng shui master.

Lum Cheng is young and impetuous, often acting rashly and displaying a degree of arrogance that can lead to disastrous outcomes. Despite these flaws, she is tenaciously loyal to her friends and allies. Her initial motivations are shaped by a desire to prove herself; she joins the Attacked Mystification Police (AMP) as a replacement for Katsumi Liqueur after Katsumi temporarily falls under the influence of the Lucifer Hawks, and early on she feels insecure about being a substitute, which fuels a competitive rivalry with Katsumi. Over time, her naïveté and earnestness help bind the AMP members together, and she becomes a steadfast member of the team.

Lum Cheng’s key relationships include her grandfather Avalanche Wong, from whom she inherits her magical lineage and sword, and her fellow AMP officers, especially Katsumi Liqueur, with whom she develops a grudging respect. She also shares a strong bond with the unit as a whole, often putting herself in danger to protect them. Her development involves overcoming her initial arrogance and learning to work cooperatively, maturing into a more reliable and integral member of the AMP.

In terms of abilities, Lum Cheng relies on the Imperial Sword Gesso for melee combat and utilizes a range of elemental magic for offense and defense. Her feng shui knowledge allows her to manipulate environmental energies and set up mystical barriers or effects. These skills make her a valuable asset in battles against the extradimensional Lucifer Hawks.