Possible Clues:

• ''Peanuts'' kid with a blanket
• Van Pelt known for sucking his thumb
• Best friend of Charlie Brown
• 'Peanuts' kid with a blanket
• Blanket-toting comics character
• Rising star I left, Lucy's brother
• Boy who said 'Sure, Charlie Brown, I can tell you what Christmas is all about'
• Middle van Pelt child in 'Peanuts'
• 'House intellectual' in 'Peanuts,' per Schulz
• "House intellectual" in "Peanuts," per Schulz