I like the Witch Hunter Captain, and I like his signature weapon, the Rapier. It’s a difficult weapon in many ways, you have to get too close to swarms to hit them, and thus take more damage than someone with a spear or Glaive. You also do not kill as much, easilly seen as your temp health grows much more slowly, than with bigger weapons. Yes you hit the swarms, but they do not die, and someone else sweeps them and kills them all.
One think you could improve was the sidearm. It is dangerous to use where it matters, up close, and can feel very gimmicky. When you hold parry, and you click the sidearm, nothing happens.
This is where the sidearm could be useful, that you keep your parry up, and can dodge back, and if you click the sidearm it overrules the parry shortly, to get of a shot while you are playing defensively. Because dropping your parry, to say hey! im gonna shoot this big axe guy instead, is going to get you damaged.
So suggestion: Let the sidearm overrule the parry so you can shoot while having RMB pressed down, instead of nothing happening when you click sidearm. This would include the sidearm in close combat fighting and give the WHC some needed melee range.