According to Entertainment Weekly, one character you see more of in the previously unseen post-credit scene is Weird Barbie (played by Kate McKinnon). She was already a hilarious addition to the cast, but turns out she had even more funny lines that didn't make the cut. It's reported that the SNL alum said things like "I'd like to see what nude blob he's packing under those jeans." and "I'd like to lift the cheese off that slice."
Also in the post-credits footage is Mattel CEO (played by Will Ferrell) telling everyone that "Barbie's in love with Ken" and Barbie (Margot Robbie) replying that she's not in love with Ken. The Mattel team then proceed to list all the other company's properties that Barbie could date. They mention toys like Hot Wheels, Pictionary and even Thomas the Tank ("Barbie, how do you feel about trains, sweetie?" one Mattel worker asks). When it comes to Barney, we find out that he's going through a divorce as Ferrell's character says, "No, I don't wish Barney on anyone," per Digital Spy.