D20 Modern / pathfinder Gestalt Advice for a friend thus time

[JuliusCromwell]

My friend will be reprising his roll as Scientists who around character level 6 wanted to be a mega man style hero

8th level

We are thinking Smart in to techiebob the D20 M Side and 6 levels of invesigator on the pf side but he wants some that work good with guns and fit the character theme

[Melkiador]

If the guns are modern, they are a lot easier to use. But the investigator isn’t great at ranged combat. You pretty much have to take the ranged study feat. You might want to consider an alchemist or slayer instead.

[Scott Wilhelm]

I'd gravitate toward Smart/Alchemist or Smart/Inquisitor. All 3 get a lot of Skill Points: 6 or 9. I'd favor a Gun Chemist or a Grenadier if you can't be a Gun Chemist. Exploding Arrows are cool, and if there is anything cooler than Exploding Arrows, it's Exploding Bullets. And I would really like to see what a Gunchemist would do with a weapon on autofire, shooting bursts of 5 exploding bullets at a time!

For Inquisitor, I'd favor the Flotsam Subdomain of Water. They get this power called Sift, that lets them reach into any quantity of water and pull out any object they want with level-determined gp limits, and it will have the Broken Condition. This seems just about perfect for a highly-skilled inventor character who solves the party's problems by having or making just the right tool for the job on the fly.