This is a posable action figure from the Nendoroid series.
From the Good Smile Company website:
From the anime series "BBK/BRNK" comes a Nendoroid of Kogane Asabuki together with Oubu's right arm, "Raijoudou" - also known as Migite-chan! She comes with three expressions including a smiling face, a worried face as well as a frenzied expression to capture the other side of her personality.
The included Migite-chan is also partially articulated allowing you to recreate a variety of different situations from relaxed scenes to tense battle scenes! Enjoy both the lively Kogane as well as the unforgettable Migite-chan together with this set!