I propose my version of the Eleventh Doctor.
Completely unpredictable, the Eleventh Doctor crosses boyish charm with actions and thoughts of a crazy professor (Yeah, like that one from college. You know you had one of those.).
Sample RP:
Amy crossed her arms, frowning at the Doctor. "A SMALL complication?"
He waved his hand dismissively at her. "Don't worry. All I have to do is relink the cables to the camfield generator and we're back in business." He paused, staring off into space. "That is, if the problem isn't with the internal circuitry." He ran his hand through his hair and whirled around. He staggered a bit as he regained his balance. "Now, I'll need your help." He popped open a panel underneath the console, then crouched down to take a look inside. "I'll need you to wiggle a few of the levers when I tell you too. See the one with the black handle?"
Amy placed her hand on a small knob.
He looked up to check that she had found the right one. "No, not that one. The other one."
"What other one?"
"The one with the lights. Controls the speed of the TARDIS."
"Oh." Amy muttered and placed her hand on the correct lever.
"Right." He ducked his head and wiggled inside the console. He drew his sonic screwdriver out of his pocket and aimed it at a clump of wires. It clicked on with a soft whirring sound. "Alright, push it up a bit."
Amy forced the lever up, and the TARDIS shook violently.
"Easy!" The Doctor yelped.