I got the 2nd time in my life 5 times IN A ROW Viper with ultra 2.
That is a chance of 1/(78^5). It's unlikely you'll ever get that in your entire life, I got it TWICE already, and another 4 times streak with another character.
I play random exclusively, and my character statistic shows not a equal usage AT ALL. the random button is everything, but not "random". wonder how that damn thing works.