My Dark Heresy psyker is growing stranger by the moment. On the mission we're on now we were passangers on an airship. He sat all day in a corner with a set of hand-sized silhouettes he had cut. He told them little stories and occasionally decapitated one. In the night he went around and put empty envelopes under the doors of everyone - including his party members. No he didn't warn them in advance. Why are you asking?
There were brigands trying to take over the airship. In the ensuing fight he accidentally spoiled all food on the ship and emitted a scream that shattered all glass within 1 km. So, pretty standard for a psyker.
At the place we are now, a monastery of sorts, we have separate cells. He has taken his remaining silhouettes (and some new ones - he carries a lot of paper) and glued them to the wall. And drawn arrows between them, seemingly at random.
I think my next move will be drawing red crayon on some of them so it looks like they are crying blood.
Oh, and he collects the noses from his enemies and has in a bag. He smokes them so they won't rot.