If possible I would definitely like to start out as a full fledged jedi that is either about to become a padawan or already is. Since that doesn't really fit with the kotor 2 scenerio provided I think they could go in a number of directions. Since they're no jedi masters, you could be echani and learn from echani pros and then later in the game become a jedi master through your own means.
First I like the idea of having someone tracking your every move and trying to sabotage you. I've always wanted a bobbo fett character in the game, either on your side or against you. I think this role would be the perfect part for a character like that. He should come along every once in a while and each time he'd have some new toys up his sleeve.
As for the character you would control I think being a force sensitive child or an echani kid on an outer rim planet would do fine. Since it's been brought up that it's not plausible to be a random dude with no real force experiance could ever take a person like Revan I think the planet you start out in would have some old true sith ruins that only you can really enter, this would further your reason to track down the true sith since you start out having ties with them, while having no retarded mandalorian fighting past with Revan. The ruins would be something like one of the caves that store force crystals and would inspire your force abilities. Ofcourse this wouldn't be enough to train you in the ways of the Force but it would start you out. Some how this would lead you to leave your planet and visit different planets and along the way pick up other people who you would have a vested interest to involve play time into.
The problem I had in both kotor 1 and 2 is that the characters were some what useless. The only characters i used were the exile, visas, kreia, and the other girl who later became a jedi since they are so overwhelmingly powerful compared to non force characters. When I say vested interest it would be like the echani girl. You worked to level her up and go through conversation to turn her into a jedi. I think adding this to a large part of the cast would be extremely nice and make it so you have to actually play with characters instead of your chosen few. What I don't want is having to use characters or items to get past certain parts of the game. Like having to use the mechanic to open the energy barriers.
But when it comes down to it, ultimately what i want to from kotor 3 is an enthralling story with multiple plot twists, decent fighting (the system doesn't bother me but a change would be nice), a polished game that isn't rushed and filled with bugs,a moderately large variety of fighting styles/moves/skills that are actually useful but not needed to progress, a cast of characters that you can enjoy and want to dig deeper into each of their unique stories and something nice to look at. I'm not asking for top of the line next gen graphics but some nice scenery shots and decent graphics, oh and for the Love of all that is in my heart for moses make it for pc too.