I read these 34 chapters in a row and man they went by quite quickly, I've really enjoyed the manga so far eventhough i don't much care for idols.
Anyway as far as the 5 girls that i would like to see win are:
Mimi - She is the main character so it's pretty obvious she will be one of the 5 but i actually kinda like her since all she really needed at the start and has become quite determined to actually do a proper debut, i like characters like that.
Ritsu - Once she started hanging out with Mimi she kinda felt like this really down to earth character somehow i especially liked how she snuck some booze to her and Mimi's cabin so they could become partners in crime
Shiori - To be honest she is still a bit of a mystery but before she got some spotlight i liked her design, her turning out to be somewhat of an airhead does help, i like airheads and i would like to know more about her.
Tsumugi - She looked like this introverted girl when she first got introduced but she does look like she is determined to make it despite her Asthma which is really nothing to scoff at considering how intense this idol stuff can be.
Karin - She is probably my favorite character in the manga because i feel like so far besides Mimi she has had the most fucus and she feels to me like her character has some depth to it, that despite her bieng a somewhat successful model she feels like she doesn't have her mothers approval and she is desperate for that, it also helps for that despite her cold exterior she does really care about the people around her.
I do like most of the other girls too but they can't all win.
The only one i really hope fucks off fast is Michiru