First character I am thinking on going down the triple dark path with dark urge warlock with The Fiend as a patron and lastly of course I'll be looking to get all the power I can from the tadpole. Just more options and more rewards for a dark playthrough. I might also try to do a dark urge paladin where I just resist the dark all the way through and see what kind of story that leads to in terms of overcoming the the dark urge.