This term refers to the aggregate of features and traits that form the individual nature of a person.

The term that refers to the aggregate of features and traits that form the individual nature of a person is "character." Character encompasses the moral and ethical qualities, personality traits, and distinguishing qualities that define an individual. It is a comprehensive concept that reflects how a person thinks and behaves, shaped by their experiences, values, and beliefs.

In contrast, ethos refers more to the guiding beliefs or ideals that characterize a group or culture, rather than an individual. Persona can denote a social façade or a role that a person adopts in various contexts, often differing from their true self. Identity, while related, encompasses broader aspects such as nationality, ethnicity, and self-concept, which can include multiple dimensions beyond mere character. Therefore, character specifically captures the essence of an individual's nature and how they behave, which makes it the most accurate choice in this context.