You think so?It's unlikely that Fanny and Swifty aren't the same person. Fanny appeared as Swifty lost his marbles, like Norman Perkins putting his mum's frock on.
Swift appears relatively rational (although he appears to have had some kind of attack last night, going nuts with Troll designations) whilst Fanny appears simply unhinged and thus very entertaining to boot.
But as you say, maybe they are alter egos.
(Posting this is scary as I will no doubt get their attention)