About the part concerning Taelia: if you rearrange the letters, you get Aelita. I don't know how significant it is but I'm willing to assume it's not coincidence. This doesn't answer to the question of who is Vivian, though.
I can definitely see the difference from the examples you provided. I hadn't even realised it before, but now that you mentioned movement as part of character's personality, it does make sense.
Have you made a written, analytic run like this of Reborn?