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Humphrey Dumpler is a mild-mannered but insane man who tries to put things back together again. He breaks into houses, breaks things, and then proceeds to try and fix them. He checks out library books to find how to repair things. This allowed Batgirl to track him. He then brought her to his house where he was trying to fix his dead but abusive grandmother.
"Humpty Dumpty" was sent to Arkham Asylum where he was a model prisoner.