Characteristics are the unique and distinguishing features that define someone or something. However, there are several synonyms to describe it. The first synonym is "attributes," which means the qualities that one possesses or has. Another synonym is "traits," which refers to the individual characteristics of someone's personality. "Qualities" is another synonym which describes the exceptionalities of someone's nature or atypical features. "Properties" can also be used to characterize a person's physical or mental features. One can also use "markers" or "hallmarks" to signify distinctive or recognizable qualities associated with someone or something. Finally, "peculiarity" can be used to refer to something that is different from anything else and distinctive in character.