Pretty much every batman villain is mentally ill in someway or another, and it’s probably easier to list the ones that aren’t. That’s why they end up in Arkham “Asylum”.
The ones that aren’t mentally ill are disfigured. And at this point, you can probably count out the only ones left.
I assume Calendar Man had a mental illness like OCD that manifested around dates due to the fact that his parents named him Julian Gregory Day.
And if someone has a mental illness in Gotham, you can bet a billionaire in S&M gear is there to beat the shit out of them.
Pretty much every batman villain is mentally ill in someway or another, and it’s probably easier to list the ones that aren’t. That’s why they end up in Arkham “Asylum”.
The ones that aren’t mentally ill are disfigured. And at this point, you can probably count out the only ones left.
Ra’s Al Ghul
Catwoman
Hush