producer (idolmaster anime)
In the Idolmaster anime, the Producer is depicted as tall bespectacled man. Although now having a face, he is still nameless. On Pixiv, this version of the Producer is known as アニマスP ("Ani-Mas-P") and 赤羽根P ("Akabane-P", nicknamed for his voice actor Akabane Kenji).
This tag implicates producer_(idolmaster) (learn more).