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I would avoid the following: Stereotypes: it is very easy to describe cliches (screaming, sadistic violence, rage outbursts, contradictory or erratic behaviour, etc.) but they lead to a flat and ...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/31559 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I would avoid the following: - Stereotypes: it is very easy to describe cliches (screaming, sadistic violence, rage outbursts, contradictory or erratic behaviour, etc.) but they lead to a flat and not interesting character. - Irrationality: don't let your character do random stuff just because it "sounds crazy". A mentally insane person always follows its own rationality, even though it differs from the more common one.