Let's talk about the Box Ghost
He's a minor nuisance to Danny, with the normal invisibility, intangibility, and flight, but he's also got control over boxes. He's got an obsession with them. Some might say... an Obsession. Boxes, as well as warehouses (as you usually find him there), link to his Obsession, or reason he's a ghost. He wears overalls, a beanie, and gloves, which indicates he was a warehouse worker. His death might have been a work-related accident, as his clothes indicate he was at work when he died. Now, why does that sound familiar? Worked in a warehouse with boxes, and died most likely to unsafe working conditions. There's only one explanation. He was an Amazon worker. Thanks Jeff Bezos, for the most memorable and annoying recurring claim villains in Danny Phantom
