Which approach to personality theory would involve a list of unique characteristics for each individual?

trait approach

Explanation:

Trait approach to a personality theory will consider various actions of individuals in order to determine their unique traits/characteristics. These traits will influence how people act in various situation (how these people act when anxious, during relaxed situation, under extreme pressure. during the time when they they need to pay attention to detail, etc.)

According to the traits approach, these characteristics will make all people acts according to their traits regardless of different situations that they face.