DW Companions as PCs: Leela

Sarah Jane leaves part way through the fourteenth season after what is (at the time) the longest run of any companion on the series. Her player is ready for something new, and comes up with a concept that's quite different from anything seen so far: her new character is going to be a Victorian street urchin.

Huh?

Bear with me.

As it turns out, the GM is already planning a scenario set in set in Victorian London, so this will be perfect. He'll be able to work the character in seamlessly, and have her back-story relevant to the plot. There's only one problem: he hasn't got very far with planning the scenario yet, which he wants to make really authentic. The Doctor's player has badgered him into running a solo game while the other is away on holiday, but, even so, the GM has two more scenarios more or less ready to go before he feels ready to run the Victorian spectacular.

So he's got a suggestion: why not run a temporary PC for those two sessions? That way the arrival of the 'real' PC can be something of a surprise to the Doctor's player, and it will enhance the plot even more. He can even work in a short story arc for the temporary PC to his existing plots, and everything will be great.