I agree with Kristin. Kaji was a breeze to potty train. Took him 1-2 weeks to catch on to the piddle pads. I personally hate them, but our current living situation calls for pads so that's what we use. Kaji is a leg lifter, which I think I encourage. When he squats to pee, which he sometimes chooses to do, he gets his front paws wet. When he lifts, it's much cleaner. I think Kaji's aim is off.
as you can see, each pup is different. As prepared as you think you may be your new pup may surprise you and be more easy or more difficult. As for personality, you should really talk to the breeder. They would probably know a thing or two and might be helpful in picking out the right personality that will compliment Luma.