J. Crane (Earth-1)

J. Crane is a patient at Arkham Asylum.

Biography
At some point, J. Crane was admitted to Arkham Asylum and was designated as patient #856220. Crane's belongings, which included test tubes filled with a strong hallucinogenic serum, were put in a box, placing it in the evidence room. When Oliver tried to hit Nora Fries with a lightning bolt, he accidentally shot J. Crane's box of belongings, spilling the hallucinogen inside the room and making Barry and Oliver see their worst fears.

Behind the scenes

 * In the DC comics, Jonathan Crane is a criminal in Gotham City who takes pride in spreading fear using his specially-designed fear toxin, and is an adversary of Batman named "Scarecrow".