Over the last few thousand years Hallowe'en has changed in character. Once upon a time it was associated with the Celtic festival Samhain. My brother is a Druid and celebrates Hallowe'en in a religious fashion with the wearing of masks and robes. In the USA a tradition called 'Trick or Treat' evolved. This tradition was unknown here in my childhood, but in recent years has crossed the pond (the Atlantic). Today's children have adopted the American habit. I'm afraid I do not understand what it is about! There is no main figure associated with modern hallowe'en. Witches are the most common figures seen on hallowe'en. But not real ones!

What do you mean "character"? We don't really have a central figure for Halloween. Personally I will watch "Its The Great Pumpkin Charlie Brown" which is a tv movie with snoopy and Charlie Brown. Its very good and perhaps for people learning English as well. What about you?