I want to build a character I am considering using in a fanfic story i am writing, and need some advice. First, I must request a bit of slack on the character, as he goes agaisnt numerous in-fiction stereotypes, and it demands ignoring alot of details to give an unbiased answer. Alright, here we go.

[FLUFF-Read if you want to]
We have one Alistair. His story starts on the Hive World of Malfi, where his childhood is a bleak affair, leading up to induction in the Guardsmen. This direction is an improvement, but he lacks much of what makes a good soldier in the 41st Millennium, and only his drive to please his superiors gets him far enough that he isn't shot, or dismissed. It is during one battle on the failed colony world of Habiloth that Alistair begins to become the character I want to stat. Here, his unit (of which he's a nameless grunt) is deployed to learn the fate of the colonists sent to erect a new Agri-world for the Calixis Sector, but instead they find no trace of the colony, the colonists, or any of their gear, as if they were never there (they sent a signal upon landing, so we know that they were). While exploring the area, seeking clues, the unit is assaulted by Eldar; of course, this is yet another case of the pristine, untouched world is actually a Maiden World, and the Eldar don't want Humans here. Alsitair's problems are twofold; his upbringing was without direction, so his hatred of xenos isn't as strong and established as it should be, and he sees among the Eldar one who stands out for she is the most beautiful thing he's ever seen. Details not important, he tries to halt the carnage between his unit and the Rangers that attacked them, and somehow his psychic potential, something no one else had noted in his 25 years, manifested, and it allowed for a halting in the violence, wherein the beautiful woman and the Rangers withdrew, and wherein Alistair was siezed, and accused of concealing his talent.

Later, while awaiting transport to Earth (so they can test his usefulness rating), the woman returns, and breaks him out. He finds out that she is a Farseer, and that she has seen events in which he figures prominently. At first they have a rocky relationship, as both their peoples hate the other, and the Imperium pretty much hates them both. Still, their proximity forces them into a relationship, wherein they both get past the seeming shortcomings of the other, and end up much like Aragorn and Arwen. Where I'm going with this is that she teaches him how to use his psychic powers, so that he isn't a danger to the both of them.
[END OF FLUFF]

My question is thus: how might I go about building him, stat-wise? Would he be a Guardsman who pays out the bum (Elite Advances) for Psy Rating talents and psychic powers, since he spent the first few years as a Guardsman, with no knowledge of his psychic power, or should I build him as a Psyker (minus Sanctioning), and give him a few talents to reflect his martial background, but also his latent ability, and, more importantly, the quality of his psyker education (the Eldar could probably make the Scholastica Psykana look like fools). As he is, he'd probably be about 1500 points in when he got abducted, and then 4000 in for the write-up, where his Psy Rating is hopefully around 4, or better, and he's got some more of an Eldar Warlock flavor to him (some of their weapons talents, and he wears their garb, though an Imperial power sword, refractor, and las pistol do stand out against the rune armor and shuriken pistol). What approach would seem best? Thanks for reading all of this, and for any advice you feel like giving.

well, really interesting character to start with, so i assume that you will be starting at rank 1 right?? is so then i might handel this much like the sisters of battle characters, who in the radicals handbook are given an option for 150 points i think to take a single witch power, which leads to them being excommunicated from their comrades and hated by thier superiors, something similar could occur, just take a sister of battle character line, call it a gaurdsmen esq character as it does have good millitary strength, don't take any of the paragons, then take that elite advance, following this treat any faith powers earned as psychich abilties, i belive that if the magical abiltiy you mentioned is the kind that you want to have then you will be fine with that.

If that doesn't float your boat, then try this, because you are starting out at rank 1, take 250 xp into guardsmen, 250 into psyker, gain 1/2 the starting skills for guard, and 1/2 the starting skils for psyker, do the same for talents and then the same for equipment and gear, use the income for whichever class you are currently working as, think of it as multiclassing, it works preety well, and ussually functions normally, as a character at the same xp rank

or you could just take guardsmen and then take advanced ranks for psy ratings...

hope this is helpful, good luck on this character sounds like fun

ah meant to ask, is this character for you to play as a player, or a NPC for you to use in a plot?...becuase if it is for a plot then disregard the 1/2 thing for multiclass plan, npc's need that little edge

I have a Psyker in my party who kicks butt in combat, so I'm pretty sure it will be easier to make a Guard-like Psyker than a Psyker-like Guard.

If you are not in a hurry, it might be worth it to wait for the Only War supplement to come out: there is sure to be some kind of Guard/Psyker hybrid in that...

OHH really?? when is that schedueled.... as for the guardsmen psyker hybrid it only works well at like 5th rank, up until the you just have psyker abilities, although taking the feral world planet may give a guardsmen background...but that would change the background...

Alistair is an NPC. If I used him, he and Astrina (couldn't come up with a creative lady Eldar name) would be in isolation on a small, infertile continent of an agri-world that just so happens to also be where they guard a webway gate. Their relationship is obviously not to kosher with either side, so the location is conveniently off the beaten path. I always liked the idea of some Inquisitor having Peer (Eldar) and Good Rep (Eldar), and having this allow, among other things, occasional access to the Webway, for speedy travel, in return for not killing them, or reporting them to the Imperium (Alistair has eliminated a few Imperials who got too close, or came looking for him; that's where some of his better gear is from). Of course, this Inquisitor keeps his advantage under his cloak, not telling the Inquisition as a whole, but he gets where he needs to, without having to find benevolent captains that you really can't "I'm an inquisitor, and I'm commandeering your vessel" effectively, and get away with it. Astrina would be guarding it, and Alistair is sort of guarding her; they are both unaware of why he's important to the future, a ways down the road.

It was my understanding, however, that characters weren't supposed to multiclass in this game; that's what hyper-expensive Elite Advances are for. If I say I am going to build him to get what I want, rather than what is 100% accurate to his story, then I could easily build him as a combat-oriented psyker (minus that Sanctioning trait), and squeeze in the few talents he needs for weapons, and it will reflect his ineptitude with them, to some degree. I'll keep my eyes open for new books, though; I always like to have new options.

ah players aren't supposed to multiclass for NPC's it is really easy to make the builds you want, and sometimes makes the most sense, and becuase this is an NPC we are talking about and it fits very well in the story i would say go ahead, expensive Advanced schemes are there to stop characters from getting super powerful, simply by multiclassing and unless this character will advance with the players he should not be an issue, alternativly you could let him grab the 1st or second psyker ranks as a alternative rank for his guardsmen self....