Lenny Fiasco was a low-grade student during his high school years, during which he was a schoolmate of Bruce Wayne. Eventually, Fiasco dropped out of school and pursued a criminal career as the masked criminal known as the Eraser.
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History
Fiasco adopted the name of Eraser as a reminder of his constant failures during his school life and also because he provided a special service to the criminals of Gotham City. Fiasco would be hired by thugs to eliminate every trace of evidence left at the crime scenes, making it impossible for the Police to find any clues. The Eraser even managed to stymie Batman and Robin, the greatest detectives in town. However, the Eraser was eventually captured by the Dynamic Duo, after they managed to infiltrate in his hideout.