Yeah, I know, a lot of you like this AU version of Echo better. >.>; And well, why not? She's cute and a good subject for speed art practice. Plus you get a glimpse into how her stutter might manifest when she's like this.
There's a pretty easy explanation for how this transformation could happen, too: Echo's powers come from prolonged raw void exposure after falling through a spacetime rip. (It's the same reason her hair is white, and why she engages in such rigorous exercise. That accident made her very sick at the time it happened, so she strengthens her body in the interest of fending off possible long-term exotic infirmities.) And since Kassie, who can spend a long time in the void without any apparent ill effects, is a genetic freak who famously manifests as a trio... I mean, the math checks out. ...And it spells conjoined triplets for you on DeviantArt.
~Az