The Hexadron says this (decoded in new game+, don't know if it is different the first time):
HI THERE HOW ARE YOU I WILL BE YOUR HEXAHEDRON TODAY
SO THIS IS JUST A ROUTINE PROCEDURE BUT I DO NEED
SOMEONE HERE JUST IN CASE SOMETHING GOES WRONG
IF SOMETHING DOES GO WRONG YOU ARE GOING TO HAVE TO CLEAN UP THE MESS
HEY WAIT A MINUTE CAN YOU EVEN UNDERSTAND WHAT I AM SAYING
AND WHAT IS WRONG WITH YOUR HEAD
OH WELL YOU ARE HERE NOW MIGHT AS WELL DO THIS THING
PREPARE TO HAVE YOUR MIND BLOWN
ALL RIGHT WELCOME TO THE CLUB ENJOY YOUR FREE HAT
I KIND OF THOUGHT MAYBE THIS WOULD NOT WORK BECAUSE
OF YOUR WEIRD HEAD BUT EVERYTHING LOOKS AOK FROM OVER HERE
THANKS FOR THE HAND YOU CAN GO HOME NOW IT WAS VERY NICE TO MEET YOU