User blog comment:MeritC/Calling all Aikatsu/Aikatsu Stars Wiki members who also have a GameFAQs account!/@comment-26426093-20160529132035/@comment-26426093-20160529134751

The main girl team for Aikatsu Stars! isn't restricted to just four characters, with the inclusion of Mahiru, it has now increased to five. I have a theory; that is, the total amount of main girl team characters will stand at 8 by the end of this season.

The reason for this is that, when you think about it, there are four classes, right? Both the Song and Beauty classes now have two main characters each (Yume/Laura and Koharu/Mahiru) respectively. It's most likely that each class will have these two idols competing against each other to take the top spot and join the S4. Also, keep in mind that Ako's class partner still hasn't been revealed yet and as of now there are no Dance Class students as of this moment.

So, I predict that the remaining three main girl team members will be slowly revealed as the series progresses; that's probably how it is going to be.

P.S. I just created a new Gamefaqs account: my username is StaraptorKwan98. Had to add the random numbers at the back since my original username was below the limit of 15 letters.