Core is Yuya Sakaki's pet cat in the Yu-Gi-Oh! ARC-V anime.
Core is an odd-eyed cat with white fur featuring a brown a heart-shaped pattern on its back and heterochromia iridum, having a yellow right eye and a blue left eye, wearing a red tie.
En's name along with Core's forms the word "encore".
After waking up from a dream, Yuya exited his bedroom to be greeted by Core and En. Later on, En is seen with other cats and dogs that Yoko Sakaki adopted.