What is mori calliope horse?

Mori Calliope is not a breed of horse, but rather a virtual talent and member of the Japanese virtual talent agency, Hololive Production. She is known for her singing and rapping skills, as well as her distinctive skull-shaped head accessory. Mori Calliope is a character created by Hololive Production as a virtual idol, who interacts with fans through livestreams, social media, and merchandise. She does not have any real-world horse characteristics or traits.