Well, what I went with, when I made Praetorians, was:
5th Praetorian Guard Regiment
Hailing from the heavily overpopulated hive-world of Praetoria, the Praetorian Guard are well known for their staunch loyalty and courage. Having come from a world of hive gangs and desolation for the majority, where their food, water, and even air is rationed based on the contribution of the individual to the world, very few Praetorians are able to even comprehend the luxury and wealth that the nobility live in, never having to worry about having their air cut off, or find that they must starve so their children can eat for one more day.
It is for reasons such as this that the strongest and most hardy of the hive volunteer for the honour to fight for the Emperor in the Praetorian Guard, where they are drilled day in and day out to be the very best Guardsman the Segmentum Tempestus can offer. Unlike many other worlds, the Praetorians are trained in the tactics of a firm line and volley fire, their units able to stand strong against, and bring down, all but the most ferocious of the Imperium's enemies with disciplined rank fire from their lasguns, their autocannons and special weapons in support to finish off those which remain. They do all this whilst looking as immaculate as they would on the parade ground, scarlet tunics containing the beating heart of a loyal soldier of the Imperium, their pith helmets highlighting them to others, often marking the point of greatest resistance against the enemy in the war-torn battlefields of the 41st millennium, especially during their most well known victory, where they managed to hold the Imperial outpost on Rorke's Drift, a small planet in the Afrik system, against the onslaught of Waaaaargh Zulug.
Characters belonging to the 5th Praetorian Guard Regiment gain the following advantages:
Characteristic Modifiers: +3 Fellowship, +3 Willpower, +3 Strength, -3 Intelligence.
Starting Skills: Common Lore (Imperium), Common Lore (Imperial Creed), Linguistics (Low Gothic), Command, Athletics.
Starting Talents: Rapid Reload, Combat Formation or Double Team.
Starting Aptitude: Willpower
Blessed Ignorance: Imperial citizens know that the proper ways of living are those tried and tested by the generations that have gone before. Horror, pain and death are the just rewards for curiosity, for those that look too deeply into the mysteries of the universe are all too likely to find malefic beings looking back at them. Their wise blindness imposes a -5 penalty on all Forbidden Lore (Int) Tests.
Kill the Mutant: The general citizens of the Imperium are trained from birth to fear mutation, for it heralds the taint of Chaos. All Imperial World characters start with Hatred (Mutants).
Wounds: Characters from this regiment generate their starting wounds normally.
Standard Regimental Kit (Arms and Armor): Per player character—M36 Lasgun with melee attachment and 4 charge packs, stub revolver with 12 Expander Round bullets, Imperial Guard Flack Armour, two frag grenades, two krak grenades.
Standard Regimental Kit (Miscellanea): Per player character—Field uniform, dress uniform, poor weather gear, sling bag, basic tools, mess kit, water canteen, blanket, sleep bag, rechargeable lamp pack, grooming kit, ident-tags, The Imperial Guardsman's Uplifting Primer, Munitorum Manual, chrono, two weeks of combat sustenance rations.
Favored Weapons: Grenade Launcher (Special), Plasma Gun (Special), Autocannon (Heavy)
Creating the 5th Praetorian Guard Regiment
Home World: Imperial World (Fits them after their training)
Commanding Officer: Fixed
Regiment Type: Line Infantry
Doctrines: Close-Order Drill, Iron Discipline
Total Cost: 9 points