Possible Clues:

• Evil spirit, maybe - no good could come of it
• Scary personification?
• Imaginary spirit who frightens children
• Unpleasant character, Moneybags, endlessly splashing out
• Imaginary male who frightens children
• Imaginary scarer of tots
• Dreadful being invoked to scare children
• Imaginary male feared by children
• Under-the-bed hider
• (Imaginary) threat to children