What does "water" in the novel mean?

In novels, describing a character as "water" usually meant that the person was gentle, soft, and easily moved, or that the person had water-like properties such as mobility, penetrability, and so on. This phrase was often used to describe a character's emotions or thoughts that were as soft as water and easily touched. For example, in a novel, a certain character was called " Water " because the character's personality was very gentle and his slow speech was easy to resonate with. This character might leave a deep impression because their emotions and thoughts are as easy to flow and permeate as water. The word " water " could also be used to describe a character's ability or characteristic. For example, their ability was like water, able to permeate and contain different things. This word can also be used to describe a character's character because their character is as soft and fluid as water, easily adapting to different environments and situations.