Hmmm. Ban-Lu sounds experienced, but maybe a bit too experienced, he sounds like he could be Xuen's dad instead of the other way around. Bugged out completely for me on the PTR but the casting animation is pretty cool.
Not sure about the colors with Yu'lei being a spitting image of Yu'lon but I was guessing it was because of Xu-Fu & Ban-Fu; wouldn't be unique if they share the same color. Or they just wanted to "muddy the waters" a bit.
I wonder if they could make a version without the aesthetics, my idea of "companion" is how Misha is to Rexxar.