There are some characters you are likely to enjoy more in fiction than you would in life. These are the dysfunctional characters who make stories interesting by behaving badly for good reason.
As the writer of these characters it is your job to understand, even if they cannot, why they do what they do. One way of doing this is to know their childhoods, their families and their key relationships. In some cases it might not be possible or appropriate to include these details in the story itself, nevertheless, you must know them so well that they inform your characters’ words and actions.
Writing prompt: Create a character whose version of the truth cannot be trusted. Incorporate at least one cliché from the list below, making it feel fresh.
like showing a red rag to a bull
it’s no picnic
time is what keeps everything from happening at once
pissed as a newt
useful as a screen door on a submarine
a day late and a dollar short
off like a prom dress