It's Mia Mousette, the cute Bri'ish mouse owned by SilentJack!

Remember to support the original artist.

Character.

mia mousette, pink nose, buck teeth, eyes visible through hair, blue eyes, blue fur, wide hips,

Clothes.

white shirt, collared shirt, brown jacket, beige skirt, pencil skirt, buttons, brown flats,

Original model.

https://civitai.com/models/1433046/mia-mousette