Are you kidding? I loved Firefly! That said, no, the Orks aren't all that much like the Reavers. Really, the Dark Eldar are closer to them, except they're like Reavers that are immortal, brilliant, and able to move fast enough to keep pace with River when she goes berserk. Glory actually has a long-running grudge against the D.Eldar because of the death of her parents. They're a vile race, who need to inflict suffering and agony on other sentient beings the way you and I need to eat or sleep. The "Craftworld Eldar," or just plain Eldar-- not necessarily "good," but not evil as the Dark Eldar-- are actually less like Vulcans than Tolkien's elves. They actually feel emotion much more intensely than we do, though that does result in a philosophy of restraint among them. Not to the extent of the Vulcans, though. You're better off imagining Tolkien elves with bedazzling technology and flashier magic.
Orks are more like this.
Winter Assault - Dis Is A WAAAGH! - YouTube Yeah. Crass Cockney pub-crawlers mixed with the Mongol Horde, as Cyber Owl once put it. They're brutal, yes, but they're also the only consistently silly/comic relief people in 40k.
Chaos is a different animal. Moreso than the rest of humanity, they are incredibly diverse. Nearly all of its followers are human, but they tend to be united more by faith in a certain chaos god out of the 4 in the pantheon than anything else. We'll not get too far into that, don't worry.
My main concern right now is in getting your character prepped. Do you not use AIM anymore? I've not seen you online in ages.
We had talked earlier about your character being a refugee on another Imperial vessel. Being tortured by the enemy is fine, but I'd recommend the insanity be downplayed a tad. If it gets to be anywhere in Tullifer Dentmind's territory, the poor sot'll probably be mind-wiped or killed. We had that rescue scenario, with the ork freebootaz. Could just as easily be Eldar corsairs, or a chaos raider.
As for your fellow's background, Inquisitors are usually being kept record of well enough that he'd not be able to go off the grid for long. Plus, they tend to be the most knowledgeable, capable, and dangerous men and women in the Imperium. I'd hold off on that until you feel comfortable reflecting that. A Rogue Trader, however, would be viable. They're allowed to be all sorts of eccentric.
If anything interests you, you can always look it up on the Lexicanum website I linked earlier in the ooc. It's a popular 40k lore wiki, highly recommend it. It's where I got a lot of my own background info.
Anyway, seems like a good place to do your thang.
