Nine is a guilty, furious war vet who goes back and meets Dickens.
Were people as scandalized the first time the Doctor changed his hair-color? He was a goddamn SCOTT for Life #12(ish).
His tastes in food change. His mannerisms change.
I think he's allowed to rotate the undercarriage every so often.
Slim's resistance to this is baffling to me.
Ten is a handsome Mockney who goes back and meets Shakespeare, and all his companions fall for him.
Eleven abandons science fiction and solves everything by being an arrogant wizard, and goes back to meet Van Gogh.
Twelve is another wizard who goes back to meet Robin Hood and gets into a cock contest about who is the best fictional hero, then posits we the viewers in dream tanks using said fiction to try to wake us up before we turn into sand.
Fans: Ooh, meta, Super Cool!
Thirteen is a self-doubting woman who goes back to meet Rosa Parks.
Fans: Eeergh, politically correct, not Doctor Who any more, my childhood is betrayed!