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Quote1 Mute, hunched over, more monster than man in the eyes of our so-called civilization-- who could have guessed that beneath your appaling appearance you have a savant brilliance when it comes to... machines. Einstein's mind in a Quasimodo's body. Even I was dumbfounded when I accidentally discovered that you are able to invent what others could never hope to imagine. Quote2
Penguin src

Harold was the leading designer and engineer of many of Batman's arsenal of gadgets and vehicles. His diminished speech capabilities and physical condition were balanced by his excellent skills in mechanics and engineering, which provided Batman with technological wonders.


Harold Allnut was born with a severe kyphosis, which gave him the appearance of a hunchback and he was also a mute. These conditions, plus his ugly appearance caused Harold troubles at his own home, where he was met with contempt and disgust from his own mother. Harold's only safe retreat were mechanics and engineering and over the years, he became proficient in fixing and creating technological devices, beyond any expert's capabilities.[1]

After years of being mistreated by his own family, Harold decided to run away from home, much to his mother's relief. Concealing his hideous features with a green cloak, Harold wandered on his own and always tried to provide a helping hand to those in need. On one occasion, he came across the mysterious vigilante known as Question, but Harold continued his path as a loner.[1]

On a certain night, while walking the lonely roads, Harold was assaulted by a group of thugs. After he was beaten, Harold was rescued by Penguin, who nursed him back to health and took him to his hideout. For months, Penguin manipulated Harold into creating a bird controlling device, which Penguin then used to create chaos in Gotham.[2] Harold eventually realized Penguin's true intentions and he turned against the criminal, allowing Batman to capture Penguin for good. Although Penguin's scheme was stopped, Harold decided to remain hidden in Penguin's hideout.[3]

Joining Batman

Some time later, Harold had relocated to an abandoned house in Gotham. He was known by the kids around the block as "Mr. Fixxit", due to his generous nature of fixing broken toys for them in exchange for food. Eventually, a little girl took a broken doll to Harold, but as he repaired it, the girl's father gathered other parents around the block and they armed themselves against the "menace". The angry mob intended to attack Harold to protect their kids from the "ugly pervert". The scandal got Batman's attention and he cleared things up, making the parents realize their mistake. Batman realized that similar things would happen if he let Harold remain homeless, or worse, he could be taken advantage by the criminals of Gotham. Finally, Batman decided to take Harold with him and give him a home in the Batcave,[4] where he started developing all sort of gadgets and new technology for Batman.[5]

When Jean-Paul Valley assumed the role of Batman, Harold and Ace were the first to see that he was out of control and they avoided him, hiding deep within the cave.[6] After months of hiding, Harold came out to greet Robin and Nightwing when they infiltrated the Batcave to place surveillance devices in order to monitor Jean-Paul's activities. Harold assisted them in their task and later returned to his hiding place.[7] When Nightwing and Robin returned, Harold assisted them in preparing the cave for Bruce's return.[8]

Leaving Batman

After Bruce took back the Mantle of the Bat, Harold resumed his activities as the technician of the Batcave, keeping himself completely out of sight from everyone. Living isolated from everyone, Harold wasn't even affected by the contagious virus that decimated the population of Gotham. However, Harold was forced to leave his self-imposed seclusion after a massive earthquake destroyed Gotham City. Wayne Manor and the Batcave were utterly destroyed and Harold was trapped in the cave along with Alfred. However, using a small tractor loader that Harold had hidden somewhere in the cave they managed to make a way out of the collapsed debris of the cave.[9]

Diligent as ever, Harold quickly started making plans and diagrams for the reconstruction of Wayne Manor and the Batcave[10] and together with Alfred, Harold started doing minor reparations in Wayne Manor.[11][12] Unfortunately, the situation of Gotham took a dire turn when the US Government decided to abandon the destroyed city and declare it a No Man's Land. In light of these events, a hopeless Alfred dismissed Harold from his services and Harold left Wayne Manor and the Batcave rather depressed. However, his spirits were quickly lifted when he realized there was a whole city that needed reparations and he eargerly went into the city to help as best as he could.[13]

Back With Azrael and Sudden Death

When Gotham City was eventually restored and the "No Man's Land" ended, Harold moved to Ossaville to assist Jean-Paul Valley in converting the castle previously owned by Lilhy into a secret hideout and began working on multiple upgrades for the new Azrael suit.[14][15] During his construction of a new array of monitors similar to the Batcomputer within the catacombs of Jean-Paul's hideout, Harold was attacked by a group thugs working for the criminal Garm who were searching for the buried body of the 'Chinese Azrael'. Harold would then accompany Jean-Paul back to Gotham City in an attempt to recover the other Azrael's corpse from Garm.[16] Harold then returned to Azrael's castle in Ossaville, where he became Azrael's full-time assistant.[17] When Batman stormed Azrael's castle, the building collapsed and Harold was caught in the debris. He was eventually rescued by paramedics and he was taken to medical care, never to be seen again.[18]

Some undisclosed time after those events, Harold was approached by Thomas Elliot, a notorious doctor and surgeon who offered Harold to operate on him, allowing him to talk and walk straight in exchange for him using his knowledge of the Batcave in order to place a tampering device in the Bat-Computer. Batman soon discovered that Harold had betrayed him, and during the confrontation, Elliot shot Harold in the head, killing him.[19]

In order to give Harold a proper burial, Batman found that his last name was "Allnut" and he buried Harold on a hill overlooking Wayne Manor.[20]


  • Genius Level Intellect: Harold's increased intelligence allowed him to come up with mechanical wonders that even experts could not even fathom.
    • Mechanical Aptitude: Harold was a veritable genius in the field of auto mechanics, and proved vital when Batman required repairs on the Batmobile or other technological devices located inside the Batcave.
  • Sewing: Harold has sewn and repaired various costumes for Tim Drake, Dick Grayson and Bruce Wayne.

Other Characteristics

  • Mute (Formerly)
  • Kyphosis: Kyphosis, which is spinal curvature either forward or back, is distinct from scoliosis -- curvature to the side. Hundreds of millions of people have either or both kinds of spinal curvature. However, good health care in developed countries today means that most people in these countries have much less severe spinal curvature than Harold. Harold's condition is suggestive of genetic bone weakness, or very bad nutrition since infancy, or many years of harsh labor and lifting heavy objects without medical aid, or all three. Historians recognize that very bad spinal curvature was common among those who did heavy labor in medieval times.

  • Harold's surname, Allnut, was revealed for the first time in Batman #619, when it was seen on his grave marker.
  • Harold is the creator of an animation program that was analogous to the real TV series Batman: The Animated Series.[21]



Batman Allies
Batman Family member
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This character is or was an incarnation of or an ally of Batman, and a member of the Batman Family. This template will automatically categorize articles that include it into the "Batman Family members" category.