Ok, after much debate throughout the whole day, I've pretty much almost gotten close to settling on an Atlan Psion. I ended up going with Atlan over Wartech. The Theme is still a little iffy, but I was thinking of using it to up his actual combat ability. So, multiclassing to a Gunslinger using the Dilettante background would help a little, so I could focus on utility psychic stuff with the Psion. The Psion can do things like teleport, link up everyone's minds, interrogate, yada yada.
But then I thought about making him with the Commando background, and giving him a set of Battle Armor. Basically, taking him more of the tech side of the equation. I'm still debating with myself over Psion, Gunslinger, or multiclassing the two. If I went an Atlan Gunslinger first, then grabbed Psion as a Multiclass, then it would probably work out pretty well.
I think that's what I'm going to do. Start him as an Atlan Gunslinger with the Commando Theme, complete with power armor, firearms and whatnot, and then at level 3 Multiclass him to a Psion. Atlans are naturally psionic, so it would make sense for his psionic abilities to manifest. This way, he's already proficient with firearms and light and medium armor, and I can use his two Theme abilities for Electrotech proficiency and a free set of Battle Armor.
Yeah. I like that. Finally. Took me two days to hash that out, but I think it'll work.