If WH40K got the Bioware Treatment...

[bluntpencil]

In fact, a game like this could very easily follow an altered Mass Effect format, and take inspiration from Dark Heresy, especially if following a Trilogy, or Act format.

Act One: Acolyte

In the first Act, you select several background options, like in Mass Effect. You select your home, your previous career and why you got recruited. These can effect starting 'alignments' and create some story elements.

You would be a lowly Acolyte working for your Inquisitor. There would be less freedom than in the Mass Effect games, at least regarding movement. A single planet might be best. Scintilla or Malfi would be ideal, and your job will be to root out heresy or whatever.

Act Two: Interrogator

After proving yourself as an Acolyte, your Inquisitor has placed his trust in you. You are now his Interrogator. Cue slightly off-camera torture scenes. You will now move to another planet, most likely, and will see slightly more of your Inquisitor, which would only raise more questions. Your companions may now see you as competition, or a trusted friend, depending on your actions and ambition.

Act Three: Inquisitor

You have gained the rosette, thanks to your heroics/brutality. You may now follow in the footsteps of your increasingly Radical mentor, as you may or may not have already been doing, or put him to the torch along with the servants of Chaos you've been fighting.