I might be wrong, but see that Miata is now drawn with her face unobstructed by her bangs. It could be that Yagi is symbolizing her maturity, as she is usually drawn with her face hidden under her hair.
And remember, waaay back then when Deneve shows everyone that she can insta-heal? (Clare's first mission) She said that half-awakening allows her to pull some crazy ass regeneration unlike before.
So, half-awakening enhances your power.
Now, Miata, she used to be very powerful, right? Now that she had her own half-awakening, who knows the extent of her new powers?
And since Yagi loves to hoard characters (see Angel Densetsu, who in turns learns from Dragon Ball), expect to see some long dead character returning to the game again.
I want Ilena/Irene. :)