This is a posable action figure from the Nendoroid series.
Adapted from the GoodSmile website:
Miku Nakano from "The Quintessential Quintuplets Movie" is joining the Nendoroid Swacchao! series! Nendoroid Swacchao! figures feature a Nendoroid sitting in a chair, making it easy to display them on desks, shelves or areas tight on space! The figures can even be displayed on the edges of your desk or shelf, so enjoy collecting and displaying them everywhere!