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There is nothing wrong with repeating stuff in a novel Your characters may very well have forgotten, or almost forgotten, about this character if enough happened in-between and his role was not to...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/33799 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/33799 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
### There is nothing wrong with repeating stuff in a novel Your characters may very well have forgotten, or almost forgotten, about this character if enough happened in-between and his role was not too magnificent. This gives you as the author the chance to repeat the most important things. If one of your characters is one who _lives in the present_ and easily forgets stuff that he deems unimportant he might have forgotten about this person and therefore asks another character "Who is this guy?", which allows you to summarize the most important points from the perspective of one of the other characters for example like "You mean John? John, who helped us that one time we being followed by enemy spies? You really want to tell me you forgot about the chase?" to which character number 1 could answer "Ah, the chase! I remember now. Fun times." Or maybe one of your characters doesn't know who the guy is that always wears a shirt with a pop-culture reference and talks like he is from the last century - simply because he never met him and nobody ever mentioned him. This gives you the chance to use the characters that have already interacted with the character to summarize the most important points about _Mister Timetraveller_ to your newer characters. Another option would be to remind the reader some time in-between. When your heroes are sitting around the camp fire and reminisce about that one time they met this guy with the mustache that seemed to have a life of its own, wondering what happened to him after they left him at the ruins. By making it a summary those readers that already remember the guy won't feel like they being told the exact same thing again and those readers that have forgotten will be reminded of him. If they have _completely_ forgotten about the character they will at least know the important things about this character again and therefore not feel like they are missing something from the story. You should try to give him a few key features that are easily remembered. A certain way to speak, certain clothes, remarkable physical aspects... maybe just a remarkable thing this character did that your characters will forever be grateful about. Depending on your story you could make your characters think he was dead and thereby remember his great heroic deeds that saved them - just to see him a few days later at the market. Maybe the character has a new scar that allows him to remind the group of the story. "Hello, _Mister Goaty_! I thought you were dead. How did you make it out alive?" to which he remarks "Ah, my little sheep! It's good to see you again. Those pesky undead don't stand a chance against someone as mighty as me! ... ", pointing at a big jagged scar on his shoulder "Though their leader did land a pretty good blow. Nothing to worry about though. What happened to you my friends while I was gone?"