This is a posable action figure from the figma series.
From the Good Smile Company website:
From the popular game "Fate/Grand Order" comes a rerelease of the Shielder demi-servant, figma Shielder/Mash Kyrielight!
Using the smooth yet posable joints of figma, you can act out a variety of different scenes.
A flexible plastic is used for important areas, allowing proportions to be kept without compromising posability.
She comes with three face plates including a expressionless face with a diligent look, a shouting expression for combat as well as the timid expression seen at the start of the game.
Optional parts include her large shield which she uses for both offence and defense.
An articulated figma stand is included, which allows various poses to be taken.