This is a writing technique I learned from an author at the Decatur Book Festival. This has been good for me in writing my books.

      Early in a novel create a "Thumbnail Characterization", which is a short passage that introduces a person in the story: 1. Briefly describing the person physically (external); 2. Giving us a quick sense of the person's personality or character (internal); and 3. treating us to a piece of dialogue that reveals something about the character.

      This is usually  under 90 words and is a great way to introduce the character. It is a quick way to introduce the character to the reader without a lot of backstory.