Absolutely.

If you are able to take it seriously, and tell yourself that your DC's are completely seperate personas from your own, I don't see why you wouldn't be able to interract with them as if they were completely different people. You could incubate a friend into your dreams based off of someone in waking life if you wished to, as long as you were able to keep reminding yourself that "this is a completely different consciousness in my mind" so much that your own conscious influence practically disappears.

And welcome to Dreamviews. 8)