My favorite member would have to be Risa Niigaki.

The thing I really love about Risa is that during all of their live performances you can tell that not only is she going at 110% the entire time, but she's having the time of her life while doing so. She really is an absolute joy to watch up on stage.

She's pretty great off stage as well. When I was first getting into Morning Musume I watched her first Alo-Hello! and that's what really made me stop and say, "Okay, she's pretty darn awesome." I just really found her scenes in the supermarket to be absolutely adorable, and her encounter with the Argentinian man on the beach is a fantastic example of just how nice a person she really is. She didn't even skip a beat when he came up to her.