RWBY Rex

RWBYsaurus (or RWBY Rex) is a recurring, unofficial character in Monty Oum's twitter feed photos. RWBYsaurus' debut was featured on Monty's twitter feed when he posted an image of Ruby and Weiss riding a dinosaur as a joke, saying that he had been awake for too long. During the RTX premier of RWBY, the "RWBYsaurus" could be seen on one frame, where a sound effect is missing, along with the text "VFX Missing", as a joke by the animators.

Trivia

 * In the band picture, the name "RWBY Rex" is written on Yang's drums; this may be the official name for RWBYsaurus.
 * Also of interesting note is that the size of RWBYsaurus has changed; in its first few artworks it was large enough for two of the girls to ride like a horse, but in the picture with Jaune Arc it appeared about the size of a small dog.