[GreatReader]

Gonna give this a try as well. Details may change later since it's like 2am here currently.

Main Rider: Kamen Rider Sheriff (can't think of a better name sorry)
Theme: Cowboys and the Wild west and stuff
Belt: The Sheriff Driver
Gimmick Items: Gunnery Badges - Essentially a badge-like trinket about the size of a Ridewatch which is slotted in the middle of the belt. Upon transforming the badge opens up like a saloon door revealing the logo/emblem of whatever form used.

Weapon: Gangun Revolver- Basically a revolver with multiple firing modes.
Rider Machine: Machine Gunner

Forms:

Sheriff Revolver - Base form
Sheriff Gatling - Long(er) range combat
Sheriff Dagger - Melee combat form
Sheriff Dynamite- High firepower
Sheriff Magnum - Super form
Sheriff Star - Final form


Secondary Rider: Kamen Rider Zorro
Weapon: The Sunzan Saber
Belt: Sheriff Driver with double badge adaptor and using Outlaw Badge and Saber Badge
Rider Machine: Storm Stallion

Enemies: Outlaws- Wanted alien criminals that are currently residing on Earth to fullfil their various goals.

And that's all I got for now. I actually have a design for him I made a couple of years ago though it kinda got burried in the pile of old drawing I have stacked in a corner