This is a posable action figure from the Nendoroid series.
From the Good Smile Company website:
From the popular anime series "Regalia: The Three Sacred Stars" comes a Nendoroid of Rena! She comes with three face plates including a standard expression, a smiling expression and a combat expression.
Optional parts include her smartphone with its cute case, Alecto transformation effect parts that include the Regalia key, a special base made to look like the inside of the Alecto as well as a magic circle effect plate. The various parts allow you to display Rena in various situations from everyday scenes to combat scenes, so be sure to add her to your collection!