Dr. Jonathan Crane was the acting chief psychiatrist at Arkham Asylum who used psychotropic drug that induced frightening hallucinations. Due to the fear the drug inspired, he created a mask modelled on the archetype of a Scarecrow.
There are roughly one-sh*t billion tropes so PLEASE look through them before adding one. Otherwise add what you like. ADDITION: PLEASE read through the trope description provided before submitting something. It's not a huge deal but too often people submit characters that don't fit just because they misinterpreted the title...
