tFR:SDtW Non Gors Workshop - NEWS! (05/31)

[Gwen]

I think a gunslinger could work if the projectiles don't go through the entire screen, that would make your character have an unfair advantage, imo (it also depends on how much of a delay you have between simple attacks)

These kind of factors are what make a gunslinger a tad bit more difficult, you have a lot more factors to consider as guns have extremely good range, and are usually strong, so you have to find ways to make them effective without being unfair and giving an unfair advantage.
The one Bleach fighter on the Wii dealt with "gunslingers" terribly. Uryuu could hop back infinitely and fire shots at the same time, as well as going across the entire battlefield, along with his attacks doing a lot of damage he was practically invincible because he could hop'n'fire and you would constantly be stuck in recoil.