(I know I'm doing the shapeshifter bit a lot,but hear me out.) Vi loved both of her siblings. Both were technical geniuses but her brother was also a boy who could shape shift. They were always getting in trouble, whether it be just them two or with echo. Sure sometimes they mess things up, but there kids. They just want to prove themselves to the older ones of the group. And they will. As long as they don't somehow find a way to burn down the city.