You can check them out here for Black Butler x Blue Exorcist, and here for Blue Exorcist x Black Butler.
The crossover collaboration features the half-demon twins Rin and Yukio Okumura wearing the costumes usually worn by Black Butler’s Sebastian Michaelis and Grell Sutcliff and vice versa.
Blue Exorcist: Kyoto Arc is premiering later this month, and the anime surprised its fans for the New Year with a collaboration with Black Butler, which also has an anime movie coming up this month, titled Black Butler: Book of the Atlantic.
Nobuhiko Okamoto, who voices Rin, is imitating Sebastian, while Daisuke Ono, who voices Sebastian, is imitating Rin.