Nutcracker and Mouse King are a pair of trycaloons from the Macy's Thanksgiving Day Parade.
History with the Macy's Parade
The Nutcracker and Mouse King first appeared in 2012, to help promote that year's run of the Macy's Holiday Parade at Universal Orlando Resort. The unit features two tricycle-balloon hybrid characters riding in tandem, with one being the title character from the Nutcracker ballet, accompanied by Clara, and the other being the Mouse King, the main antagonist of the story, accompanied by one of his minions.
They continued to appear at Universal Studios until 2016, when they were retired alongside everything else, due to the Holiday Parade being re-branded into Universal's Holiday Parade Featuring Macy's. Despite this, they still make appearances in the main Parade as of 2019.
Due to the trycaloons no longer being needed after the rebranding as previously mentioned above, they have made appearances in the Macy's Holiday Parade in Seattle from 2017 to 2019.
In addition to appearing as a trycaloon, the Nutcracker had also appeared as a novelty balloon since 2017. A separate article for this balloon can be read here.