Pierre

Pierre is a former part-time amusement park mascot. Hidden beneath the full-body Froggie costume is a golden-haired pretty boy. In truth, he is the prince of a certain country. Due to infighting over the crown's successor, he made a sneaky escape by "visiting Japan." Pierre is a boy both bright and innocent who wishes to use his own power to bring smiles to all.

(Source: The iDOLM@STER Wiki)