If canon were ever an animated series, he would be voiced by Ben Barnes (using his American accent).

Casimir suffers from fibromyalgia.

One of his very first roles on Broadway was a background newsie from Newsies; he eventually moved his way up to playing Racetrack and then Jack Kelly.

He adores Gene Kelly, Debbie Reynolds, and Fred Astaire movies. They're his favorite of all things because it's one of the things he bonded with his grandfather about.

His dream is to star in a remake of Singin' In the Rain.

Due to his unicorn heritage, he can, in a certain way, sparkle.