Jonathan Crane

The Scarecrow is the alter ego and disguise of doctor Jonathan Crane, a scientist and former Gotham University professor turned supervillain. He fights his opponents with a fear gas.

Dr. Jonathan Crane has been obsessed with fear ever since he was a child. He was a professor of psychology at Gotham City University. His experiments were too dangerous so he lost his job due to terror of his patients and students. He became evil and and used various drugs, chemicals, and devices. He took the name "Scarecrow" which the bullies gave him as a boy. And would use it to become one of the most feared criminals of Gotham.

Scarecrow is a thin male who wears a crudely assembled scarecrow mask, made out of a burlap sack; the stitching on the mask forms its mouth. He also wears burlap gloves that match his mask and a floppy, tattered brown scarecrow hat. He also wears a red sweater and old brown pants.

Although as an inmate at Arkham Asylum, he is still quite intellectual. Enough to have a third backup plan just in case.

The Scarecrow is a criminally insane genius often considered to be one of the Batman's most dangerous enemies. He is utterly obsessed with the concept of fear and uses specially made chemicals of his own creation to spread as much fear and terror as possible across the masses all as part of his research.