Literally? Don't nerf Stamper too hard and make the new sword cool. That's all you need to make me happy.
It's funny because I feel like Wiper Deco being my single most used weapon has kind of made it easy for me to pick up other weapons. It doesn't have the best kill time unless I get very close to people (which I don't super often), its range isn't anything crazy even if it's pretty nice, and it doesn't have a bomb, so with all of that I've had to learn to approach fights pretty differently than I would with other weapons. I was able to pick up weapons like the Explosher or Recycled Brella a bit quicker and without putting as much effort as I think I should have just because I have a general idea of what my positioning should look like and how I should be looking to attack people.
That being said, I don't even care if the new sword is good. Both swords are already very good and I'm plenty capable of having fun with weapons that aren't the most successful in a solo environment. I'm sure I can draw some similarities between using it and one or two of Stamper, Ballpoint and Explo and try to adjust how I play it accordingly. As long as it feels similarly expressive to use as the other swords, maybe with a decent learning curve too, that'll be more than enough for me.
