Panthro. The most badassed of them all.
I also liked Wilykit and Wilykat when they were supposed to be older than Lion-O as well as his instructors and not suddenly be kiddies that get into all sorts of crazy trouble.
Snarf can die in a fire. No, that's not fair, then the Thundercats would be without their emergency food source and slave labor. Because that is what the Snarf race was on old Thunderra, slave labor and food.