Here's one I came up with for my group's Apostate. He really wants to play a guy who is almost exclusively non-combat focused. Very much a "Let's you and him fight" type guy. As time goes by, he's going to have an easier time of it, but right now they are on the Chains of Torment in the intro adventure, so I wanted something both useful and in keeping with the location.
Corrupted Rendering Servitor
This servitor was originally used to assist in butchering and rendering livestock for consumption by the crew of the Chains of Judgement, but long exposure to the warp has corrupted it with a feral hunger for flesh.
Statistics: Stats in parentheses are stats when frenzied.
WS: 30 (40)
BS: 01 (00)
S: 30 (40)
T: 30 (40)
Int: 01 (00)
WP: 06 (16)
Athletics (Str), Parry (WS), Dodge (Agi), Stealth (Agi)
Sound Constitution (3), Weapon Training (Chain), Frenzy
Chain Greatsword (2d10+5 R, Pen 3, Tearing, Unbalanced)
Machine (2) and Subdermal Reinforcement (Counts as Guard Flak Armour) - 6 AP all locations.
Notes: I only selected 1 Trait, and I gave it +20 Attributes with the remaining traits (+10 for each one turned in), which I based off the Deathwatch First Founding rules. I added Frenzy as a figured it was the easiest way to add a little crunch to the minion in combat without upping it to a basic Minion. Int, WP, and Fel are all low, but only the WP (and to a lesser extent the Per) really bothers me. I am going to be ruling that to drop out of frenzy at the end of combat it will use a Loyalty check instead of a WP check, as otherwise the darn thing will just keep chopping until someone kicks it over.
Given how my player runs his character (in the back behind the biggest Chaos Marine in the group), I figure he will be able to keep it close to him, and then spend a round "rousing the blood spirits" of his servitor when bad guys get close, and then firing it off into the nearest bad guy (or good guy, in this case?).
Of course, since this is Black Crusade, I've already thought of a few ways to mess with his head on this stuff... like maybe having the servitor randomly wander off and return covered in blood for no apparent reason, or have it stare constantly at another party member when not in use. I like to give my players stuff to play with, but I do enjoy messing with them a little bit at the same time...