Nate Jones was the first pro I met, I remember him giving me a Spitfire sticker. Super nice guy.
Met a shit load when I was younger when I use to go to demos a fair bit. Everyone was cool, in particular Danny Supa, Rick Howard, Herman, Salabanzi, Glifberg all come to mind as really friendly encounters.
Recently - Trapasso & Jose were both super friendly and talkative.