Mew is a Japanese VOCALOID developed and distributed by YAMAHA Corporation, and was released for the VOCALOID3 engine.
Her appearance was illustrated by Ootani Ryuuji, like many of his female characters, Mew is pale-skinned, black-haired, and wears simple styled clothing.
The cat Mew is pictured with is Savami, based on the voice providers own pet.