Rina is a girl that has a lot of different views from her fans- I'll say that as much. While she doesn't appeal to me very much, it's interesting to see the take they went with her to have an idol with a hidden face and a "board" instead. It's something unique from other games and franchises.

Happy Birthday, Rina~ I do hope one day we will be able to see your face and maybe I'll be able to learn more about you than your board.