I did this recently in the voice of a Dickens character (our brief was to write a monologue in the voice of a character we liked). Because of the distinctive style of Dickens it worked well, and was easier than writing in the style of a less 'ordinary' one.
I would choose an idiosyncratic author with an easily recognisable style, particularly if it doesn't matter if you slip into parody.
Opinions on this crossword, please
Tracksuits To Become Standard School Uniform?
