^ Pretty much being the only girl with dyed hair, she's pretty hard to miss!
But there is another who is very easily recognizable whether she's wearing a mask or not, Center Tachibana Anna.
She's the one that wears the Red Mask, but even in events where she's got a white one, you can still tell which is her because she's always got her hair in a ponytail and wears a bow on top of her head.
In the MV though, Risa Sawada is wearing goggles on her head, if that becomes her thing (as I believe there was a former member before who did), she'd make three!