Characterization refers to the process of describing and bringing a character to life in a story. It includes providing details about their appearance, personality, thoughts, and actions to help readers understand them better. Full definition
It is an important tool for many scientific disciplines as it allows qualitative and quantitative examination of the whole cells as well as characterization of cells within a sample. (sanger.ac.uk)
The story is rich in characterization as well as imagery. (booklistonline.com)
Their issue isn't only with characterization, of course. (cbr.com)