There is some debate about whether Sunny's ability allows you to add a result after rolling 0 dice.
FFG has already defined that you can roll 0 dice and then activate upgrades like accuracy corrector. They have also ruled that a Target Lock allows you to reroll 0 dice. So Sunny's ability can trigger with 0 dice on a roll or reroll.
The part where the ability fails is that the result of rolling 0 dice is that 0 focus, 0 evade, and 0 blank results exist.
In the physical world, there is nothing to match, so Sunny's ability does not resolve.
In a theoretical world, it may be argued that there exists a "number" of focus, evade, and blank results (which is 0.) If all exist, then they are not the same and Sunny's ability also fails.
I am not sure of the logic supporting the idea that Sunny can add a result after rolling 0 dice, but it can be debated here if anyone feels it is valid.
Edited by USCGrad90