Lydia

From Peanuts Wiki

Lydia was a girl who was first shown in Peanuts on 6/9/86. She is mostly only shown with Linus. She always says stuff to Linus like "Aren't you kind of old for me?" She also changed her named a lot like "Today my name is Anna" Linus liked at her at first but soon he treated her just like the way he treated Sally.