I think it would be funny to see what the inhabitants of the "Sistar" unit will be, which are obviously the Legos of Finn's sister in the real world. I was thinking it would feature girly Lego sets such as Lego Friends, DC Super Hero Girls, or even the Powerpuff Girls! I'd love to see the PPG in the movie, it would make it their first appearance in a theatrical film since the Powderpuff Girls movie from 2002.
I also hope to see characters from the Lego Batman and Lego Ninjago movies return as well! And fingers crossed for Lego characters that weren't in the first movie to show up like from Spongebob Squarepants, Marvel, Ghostbusters, Angry Birds, Minecraft, and Indiana Jones!
like any type minifigs, posable bigfigs or figures, weapons and accessories, vehicle (like cars trucks tanks aircrafts and spacecrafts of any size) and parts of accessories like billboards or signs also decals.