Just an idea request: may i have any ideas for creative writing regarding a mental illness?

e. g: imagine having schizophrenia and having imaginary friends until you slowly realise they arent rea,

A narcissistic psychopath who calls himself the "Fireman." Mostly because he is a fireman. He's an arsonist ( in his limited free time) who revels in the minimalistic chaos he causes. But he never imagined killing a human (or trying to) - until one of his "hobbies" goes wrong, causing a freak accident that kills a bunch of people...

You decide what comes next.

the correct answer is (a) . answer should be simple, clear and brief.