This item is a posable action figure from the Nendoroid series.
From the Good Smile Company website:
From the popular anime series "IS" comes the fifth Nendoroid from the series, Charlotte Dunois! She comes with three expressions including a cheerful standard expression, an embarrassed expression and an angry expression wearing a fake smile.
She also comes with various optional parts to recreate scenes from the series - including her pendant, a strawberry crêpe and even an "IS" activated right arm part! Special parts to recreate the running pose in the ending theme are also included.