Orange is one of Blue's many friends from preschool, a young ornage cat owned by a female human named Sam. The character celebrates Hanukkah with Sam, meaning that her owner's family is Jewish.
Orange is flame orange with a small, triangular, dark pink nose. She has darker whiskers and a desert sand tummy and muzzle, plus several stripes of the same color on her head and tail (3 triangular ones on her head [her ears are located between the stripes], and up to 3 stripes around her tail). She also has a pair of small black eyes and eyebrows.
In "Blue's Big Holiday", it is revealed that Orange is owned by a female human named Sam. In that very episode, she and Sam can be seen celebrating Hanukkah. Though it was probably for demonstrative purposes only, it could be speculated that one, or both of them are of Jewish faith, or have interest in Jewish culture.
Orange was the first cat to appear, others being Green, Blue, Yellow, and Periwinkle.
On that same episode, Orange Kitten gave Periwinkle a picture that had a group of friends on it as a welcoming gift for his first day of school.
Orange was mad at Periwinkle in two episodes. In "Blue Takes You to School" she got mad at Periwinkle because he got her and Green Puppy wet. In "Soccer Practice", Orange got mad at Periwinkle because when she was trying to shoot the goal, but Periwinkle ran up to the ball and took it.