Animancer! I was actually weirded out that this wasn't a Wizard subclass or something, but it makes great sense for the setting. Basically a ranger-type but with construct pets, and the animancer gets to use abilities like that of the Essence Interrupter, but not intrinsically - they need use of tools that they can upgrade.
I also think a Pistoleer/Gunhawk needs to be separated from the Ranger - the Ranger gives a nature's friend vibe while the Pistoleer/Gunhawk is anything but. Give them their own special skills for firearms - the special abilities some weapons have, like Thunderous Report, Concealing Cloud etc. are a good start.
