As a card, the Brasshopper is great. You can deploy it at close range when it is most effective or when you have accuracy or another card to increase its effectiveness. But as a character passive? It just...kind of sucks.
Stevie Gull's Golden Boira does better DMG at range AND close up—and this should be no surprise. The Golden Boira is a 2 cost card, the Brasshopper is 1. From the purely weapon card perspective, the Golden Boira should be mostly better. But as a character passive? That shouldn't apply when there are better options available.
Here's why I propose: Myk Reaver starts with a custom Brasshopper. This Brasshopper is more accurate, and deals a bit more DMG overall. I'm not sure on the numbers, but something to make it compete a bit more with Stevie, since right now his passive is better in most situations.