Did William Shakespeare have any idiosycrancies?

Answer 1

We don't know about any personal idiosyncrasies because we do not know that much about his personal life. He did have some writing techniques which were characteristic--a fondness for the archaic second-person forms, a liking for certain puns and so on.

Some of this can be surmised to be because he retained the Warwickshire pronunciations and spellings from his youth in Stratford, before spelling became standardized on the London dialect and accent.