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Pick one thing that all the characters have in common, and I'd make it subtle. In dialogue, Loki has a favorite word, perhaps a curse, that no other character in the book uses. You might also give ...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/48578 License name: CC BY-SA 4.0 License URL: https://creativecommons.org/licenses/by-sa/4.0/
#2: Initial revision
Pick **one thing** that all the characters have in common, and I'd make it subtle. In dialogue, Loki has a favorite word, perhaps a curse, that no other character in the book uses. You might also give him a grammatical quirk, that no other character uses, and if any imitate him, he punishes them for mocking him. Find something you can use fairly often, the equivalent in American English of "fuck" or "shit", a generic all-purpose curse, and in moments of anger or frustration he lets slip his ten-thousand year old version of it. Don't be heavy-handed, with visual cues like eyes and lip scars, there is no need. The audience will pick up on this **one thing.** Now you might think, this could be a family thing or cult thing, all these people might be a related group. But that is easily defeated with standard prose; whichever mask Loki is wearing, he has the same unique memories and experiences, and you can find opportunity for him to reference something he did in Mask A, while he is in Mask B, in a setting where we are inclined to believe he is telling the truth. For example As B, Loki casually explains to a collaborator what he personally saw in Chicago, but the reader knows it was Mask A that saw that. Don't try to be so explicit, leave clues and the reader will figure it out, and it will be more fun for them than if you are heavy-handed about making sure they get it.