Teenage Mutant Ninja Turtles (Mirage): In issue #15, a Pippi Longstocking comic is among the comics displayed at the comic book shop that Michelangelo, Raphael, and Casey Jones go to.
Clueless: When Cher and Josh are helping her father (Josh's stepfather) out, Josh looks at Cher with her pigtails, and says she looks like Pippi Longstocking. Cher has no idea who that is.
The Boys. Stormfront mentions being a fan of Pippi Longstocking when she was young, and uses her as example of someone who just did her own thing regardless of what others thought.
The Family Ties episode "My Best Friend's Girl" has a character named Pippi because her parents were Pippi Longstocking fans.
In Daria episode "Pinch Sitter", Daria is spending the evening babysitting two children who she "allows" to redo her hair, and they end up giving her braided pigtails with four pink bow-tied ribbons. Jane greets her at the door with an enthusiastic, "All hail, Pippi Longstocking."