Matt Mercer. Critical Role is an entertaining series and I've talked about my love for his Blood Hunter (formerly Witch Hunter, now with the Order of the Lycan) class a few times. Matt has also released a pay-what-you-want Gunslinger Martial Archetype for Fighters.
Okay, I know, many people don't like guns with their D&D. I understand that and there was a time I was absolutely opposed to the idea. My stance isn't that strong anymore. While I don't like them to be common, I've seen how much fun a lone gunslinger can be to a Pathfinder game. Matt's Gunslinger archetype definitely draws on that class. Essentially this fighter archetype grants characters proficiency in firearms and grit, which is a resource that can be spent to have a better chance to hit, inflict more damage, or do trickshots and things of that nature. It also includes a firearms weapon chart.
The class looks like a lot of fun for firearm friendly games. The Gunslinger, Blood Hunter, and Order of the Lycan are all self-contained and can be used alongside the Basic rules set if you don't have the Player's Handbook.