Possible Clues:

• Lucy's blanket-toting brother
• "Peanuts" boy
• Lucy's little brother
• Only Nobelist besides Marie to win the prize in two fields
• ___ and Charlie Browns ('Arrested Development' euphemism)
• Fan of the Great Pumpkin
• "Peanuts" character with a security blanket
• Member of the Peanuts gang
• -- van Pelt, a character in the comic series 'Peanuts'
• Boy with a blue blanket