Peter Capaldi has said that the new Doctor Who companion has to stand up to his character, adding that the Jenna Coleman replacement must not take the Doctor too seriously. 

Capaldi recently confirmed that a new assistant been cast, and that they offer a "different sort of take" on the role. However, rumours that it could be a male actor who takes the position seemed far off the mark going by comments made by Capaldi in an interview given to Mexican blogger La Lata.

"I think the companion has to be someone who’s not so impressed by the Doctor – she’s not an assistant, she’s not a servant, she can’t be that – she has to be someone who really says ‘are you sure that’s the right thing to do? What are you doing?’ and also doesn’t take him seriously," Capaldi is quoted as saying by the Radio Times.

The position of the Doctor's companion has been filled by Billie Piper, Karen Gillan and Jenna Coleman in recent years with the latter's Clara Oswald departing in the most recent series and opening up a vacancy alongside Capaldi.

Speculation has been rife as to who could replace her, with Maisie Williams an early favourite until she recently ruled herself out.