I understand there are some complications when it comes to designing the RWBY characters, so I do hope Blake, and likely eventually Yang, are going to be free DLC, and the reason why they are DLC is because the complications involved with making them would prevent the game from being released when planned if they were included in the base game.
This way they can still be in the game like they rightfully should be, but in a way that won't upset fans or delay the game.
But it's also likely they'll make them like $7 each anyway. If they do so, I will not outright encourage a riot, however...