I was initially going to run Deathwatch when I took a look into the different WH40k RPGs, but due to its (slightly) more complex system alongside the fact that I've never run a 40k RPG before and my lack of a decent sized group, I decided to back up to Dark Heresy for now.
Now, here's my big question. I'm going to be GMing a single player, my dad. Is this game friendly toward solo players?
If it is not, my next question is how do I make it friendly for a single player? I'm not saying friendly like sunshine and butterflies and he's never going to be at risk at all, but on that same note, if this game is designed for a minimal group of x players, I don't want to overwhelm him.
I should of course design most adventures around his capabilities, but what about the combat aspect and all? Are there natural ways to scale the difficulty of the game appropriately aside from decreasing the amount of enemies present at any given time?