One day, you wake up as a human lie detector who is able to accurately tell when someone is lying. Your ability tells you that everything your best friend says, including their name, is a lie. (Pinning for the description not the actual prompt)
When you were a child, you saw your parents get killed by a delusional man who claimed he was a time traveller. You thought he was just crazy, but as years pass and you grow older, your best friend starts to look eerily similar to your parents killer.
Imaginary friend stays with kid through childhood and adolescence. Person starts complaining about it around In early-mid twenties, person is admitted to mental institution and diagnosed with schizophrenia and imaginary friend fights to stay