I was thinking of making a computer hero at castle of every base to ensure that a player can't easily take out the base by himself. The hero cannot attack another base or anything, just is there to protect the base. The Human Leader would be Uther, Orc would be Thrall, Undead would be Amon'Rah or whatever, unless you're willing to do Arthas somehow. Or you could do Kil'Jaeden/Archimonde, and then NE=The Warden, forgot name.