Blue (left), Yellow (right)
Haku is Shiro's cat that he is secretly taking care of. He's a gluttonous cat.
Haku is a large white cat with heterochromatic eyes; his left eye is blue and his right eye is yellow. He wears a green tie around his neck similar to that of Shiro's and has a gold ear piercing tag in his left ear with the number 89 printed on it.
Describe personality here.
- "Ha" in Haku's name means "eight" and "ku" means "nine," which is an allusion to his ear tag's number.
- Haku could also mean "white," like his fur.
- Haku makes a brief cameo appearance in Episode 11 of the anime, in the form of a large plush toy. However, as opposed to having Haku's heterochromatic eyes, both of the toy's eyes were blue.