The Peanuts character known for carrying a security blanket is Linus van Pelt.
Linus is Charlie Brown’s best friend and one of Charles M. Schulz’s most thoughtful characters. He is usually shown clutching a blue security blanket, often while sucking his thumb. The blanket is a symbol of comfort and vulnerability, but it does not prevent Linus from acting as the group’s intellectual and philosophical voice.
Linus first appeared in Peanuts on September 19, 1952, and he was first shown with his security blanket in 1954. His older sister, Lucy, regularly mocks him for carrying it, yet Linus remains attached to it throughout much of the strip. Because he is also the principal believer in the Great Pumpkin, readers sometimes associate him more strongly with Halloween stories than with the blanket itself.
Rerun is Linus’s younger brother, while Schroeder is the Beethoven-loving pianist and Charlie Brown is the group’s often-unlucky leader. None of them is the blanket carrier. Linus’s combination of childish dependence and surprising wisdom became one of Peanuts’ most recognizable character contrasts.