Princess Unikitty is required to complete the game at 100% because she is the only character that can use the rainbow glass, locks, etc. If you see rainbow colored material covering a puzzle, you will need Unikitty.Unikitty is one of my preferred characters to play with in Lego Dimensions. I like her because she's kind of silly - shooting rainbows, leaving rainbow glitter where she goes and growing big and red when she's mad.We are storing all of our figurines in a container that has individual squares for items and she lives with Emmett and Wyldstyle. Unfortunately, Unikitty is fragile and loses her head quite a bit. The head is only locked into place with one Lego circle. I am seriously considering using a dab of super glue to keep her head attached permanently.The Cloud Cuckoo car is a flying vehicle and maneuvers like all of the other flying vehicles in this game. You can upgrade it a total of 3 times and it transforms each time you upgrade. The one thing I don't like is that you can't return to the original version of the vehicle - but that's how all vehicles work in Lego Dimensions, not just the Cloud Cuckoo car.Overall, we use her at least once in each adventure world and each level. You're going to need her, so just get her so that you don't have to go back and play the world or level over and over again to reach 100% completion.