It's what has me the most excited honestly...I suggested the possibility of all new characters when MOTUC was getting started and most fans kinda dismissed the idea, saying there were enough established characters without adding new ones.
Part of the excitement back in the 80's was, you never knew what was coming next.
Hero? Villain? Monster? Robot? Mutant? Demon? Alien? Wizard?
With MOTU...the sky's the limit!