I second Count Lauriel on the front that you should try and flesh out your character as much as possible, like you did with your other Orc, let things continue after quests, don't limit yourself to them. Play it more like real life, take RP to the extreme. Sleep, eat, take baths, take leaks, everything.
This can be done with any character at all, ranging from Mages, to Warriors, to Thieves, to Non-Combat characters, to hybrids. I actually would recommend that you continue on with your Orc, as his build was one you liked, and you built up his back-story pretty well too, so things can keep going forever. Remember, don't limit yourself to quests.
Although one point is, that for us console gamers, it's a lot harder to RP, but still; I have commitment issues in real life, and I managed to stick with one character for 4 years. If I can do it, anyone can.