When somebody blacks out so hard they act out of character to the point that they become a completely different person

The black character or characters on a tv show or movie that will inevitably die, and usually has no real significance to the plot other than to die.

A group of one or more characters that usually are seen in many series, games, movies, and plays, They usually have different families, friends, jobs, hobbies, personalities etc and make many cameos in different scenes

You can find background characters in many media such as Spongebob Squarepants

a literary or dramatic character who undergoes little or no inner change; a character who does not grow or develop.

A person playing stupid for fame. The person does and says anything that gets a reaction out of people.

The act of going to someone's house, picking up any object you see, presenting it in some fashion(wether through a small dance or holding it in the air) and hiding it on your person.

just like a spirit animal but it's a fictional character instead ; it is used to relate to non-existant characters from an anime , series , films ect.. we can also say it is a representation of you or what you want to be.