This character is described as being atypically short for a person their age, gender and species. This information can be stated directly, or inferred by comparing them to other characters in the same VN.

For example, if an elementary school student is described as short relative to an adult character, this trait does NOT apply. However, if an adult man is described as short relative to other adult men, or an elementary school girl is described as a head shorter than the other girls in her class, this trait DOES apply.

If the VN's text doesn't talk about the character's height, just assume they are average height for their age, gender and species, and don't bother adding any height traits to them.