May 9
Fun fact: Rainbow Happy Trails is about as small to Midnight Marvel as she is to most normal sized people. These two come from very different regimes of the Changeling Syndicate for very different purposes, and probably wouldn't get along very well. Note that the pupil size between Rainbow Happy Trails and Midnight Marvel is consistent. It's an example of part re-use, which helped keep the Rainbow Happy Trails program less costly.
Those numbers are the actual patent numbers of Midnight Marvel Hibiscus and Rainbow Happy Trails Rose.