Who is the most serious out of all these wrestler's?

When you see wrestler's in interview's you see this totally ultra seriousness nowadays? The wrestler's who I think are the most serious are Shawn Michaels (which is awkward because he used to be the exact opposite, funny and playful), Chris Benoit, Ric Flair, The Undertaker character in like 1994, John Cena, or Judith Sheindlin off of television's Judge Judy