D, quite simply, had to be The Doctor.
It also, of course, had to be Darth Vader.
Personally, I think I’ve struck potential televisual spin-off gold here – Lucas and Moffat, take note.
“Of course timey-wimey beats Sith!
I’m made in Cardiff so… Cymru am byth!”
“Feel the Force. Soon you’ll see.”
“Nope. Shalln’t. Allons-y!”
“I’m your father.” “Nice try, I’m a Smith!*”
(*Yes, I know ‘Allons-y’ was Tennant – the Smith in question here is John Smith, The Doctor’s commonly used alias. So there, smarty pants.**)
(** Ok, fine, ‘Allons-y’ and ‘Smith’ made life easier.)