The list of creepy villains locked up in Gotham City's Arkham Asylum seems endless, but no inmate is as creepy as the one who only makes an appearance in one of DC's comic book series.
DC's Arkham Asylum is a psychiatric hospital that houses Gotham's criminally insane. Most of these criminals are well known and have even appeared in major motion pictures including The Riddler, Scarecrow, as well as the notorious Joker. But there is one lesser known and creepy criminal that appears in the comic series Arkham Asylum: Living Hell and the reason he's lesser known is because his introduction and demise take place within the comic series.
Writer Dan Slott and penciler Ryan Sook introduce a few characters in the comic book series Arkham Asylum: Living Hell including the DC villains Humphry Dumpler a.k.a. Humpty Dumpty, a child-like man who can fix things as easily as he can tear them apart; Death Rattle a.k.a. Erasmus Rayne, a man who can communicate with the dead;and Warren White a.k.a. The Great White Shark, an ordinary rich-man turned into a criminal mastermind. Although it's creepy knowing Warren White becomes the villain The Great White Shark after parts of his face freezes off in Mr. Freeze's cell, nothing is as creepy as Daedalus Boch a.k.a. Doodlebug, a criminal who uses people's blood and body parts to paint his murals.
In Slott and Sook's comic series, after Doodlebug is detained by police for using a woman's blood to paint demonic symbols on a building in Gotham City, he is placed in one of Arkham Asylum's cells with Death Rattle. Eventually, when Arkham Asylum is in utter turmoil, Doodlebug and Death Rattle escape from their cell using a security guard's severed hand that has been stored inside of a pickle jar in Death Rattle's mattress. Soon after escaping from the cell, Doodlebug finds some purple paint and begins to create a mural on the prison walls. When Death Rattle discovers what Doodlebug is doing, he tries to pry him away from his artwork and warns him that the guards will be coming soon. Death Rattle also tells Doodlebug his paint is almost gone, which gives Doodlebug an idea. After taking another look at Death Rattle and seeing demonic symbols all over his body, he rips out one of his organs and begins to paint the walls with it.
It's imperative to note that part of the reason Doodlebug paints the walls with demonic symbols as well as people's blood is because he sees visions of the coming of a great and powerful demon. Although Doodlebug is indeed delusional, he is correct about his visions because demons called the Skarva are using him to summon the demon Cthugha. Towards the end of the comic series, when Doodlebug is painting the walls of Arkham with the blood of inmates as well as sacrificing people to hellfire, he makes the discovery that the demonic symbols are all over his body. Meaning, he will be sacrificed too. In an instant, he disappears and is sent to Hell.
Because Batman plays a small roll in the comic series and only shows up at Arkham Asylum twice, it would've been nice to see the Dark Knight go toe to toe with the delusional Doodlebug. But it makes sense as to why Batman keeps his distance, Arkham Asylum is crazy enough to make him question his own sanity.