What would you say is the principle means of characterization employed by the author

When The author add Characterization it means a way of describing the character in the story with out say what it is right out. like I could say the boy is a weird crazy cat person or I could write the boy was very fond of cats and to others it came across very strange that he would sit for hours and months with his cat.

the diffrence is the way they make the character sound in the story they are writing