A unifying characteristic.
You could either be referring to a flat character (characters in a story who do not go through substantial change or growth throughout the story) or a static character (a character who goes through no change)
Mildred is a static character in Fahrenheit 451 because she remains largely unchanged throughout the story. She represents the conformity and lack of critical thinking in the society depicted in the novel, and her character serves as a contrast to Montag's transformation.
He is a static character
The character named Horatio in Hamlet is a dynamic character.
Static Character.
Who is the static character in the Third wish
He is a static character
He is known as a static characterVindictive
A static character is a character in dramatics that doesn't really change. An example sentence would be: They barely remembered anything about the static character.
A character who does not undergo any change throughout a story is considered a static or a flat character, in contrast to a dynamic character or a round character, who undergoes a change throughout the story.
The character Fortinbraz in Hamlet is a minor character and considered a static character.
a Static Character means that the character does not change much in the course of a story.