This is a posable action figure from the Nendoroid series.
From the Good Smile Company website:
From the anime series "Charlotte" comes a Nendoroid of the cute and innocent little sister that loves her older bother, Ayumi Otosaka! She comes with four different expressions including a smiling expression, an angry expression as well as an excited expression and blissful expression for watching her favorite band - How-Low-Hello!
Her special omelette rice filled with the Otosaka family special pizza sauce is also included, as well as a special nose bleed part to recreate her explosive bloody noses! Enjoy all sorts of poses right from the series!