https://en.wikipedia.org/wiki/Daeva
I'm not sure but I think you might want to explain what you mean by "like a Daeva", because it seems like you might mean something else than it's Wikipedia entry. Perhaps some game or anime or something has a "Daeva" in it?
Or, are you perhaps referring to something like this?
In other words, a blitzkrieg unit. But then, Tracer and Genji already serve that purpose, and are much better at it.
I would like to reiterate that in my personal experience, the only time a D.Va has been a problem has been when I'm playing Widow, so for me at least they seem to boil down to two things; 1) Widow harassing and 2) Q nukes.