Mythological creatures: Cyclops, Centaurs (I just love centaurs, fast AND smart), how are those creatures with the snakes as hair called again? Gorgons or something like that?
Hell Hounds, Infernos,... ofcours these creatures aren't really original, but in my opinion they are cool.
Harpies(in really large groups) and other dragons would be great opponents for the dragon.
Really LARGE creatures like in 'Shadow of the Colossus'(Great game), wich need to be beaten with tricks, like dropping heavy things on them to break their armor.

I really like the idea of mythological creatures in the game <img src="/ubbthreads/images/graemlins/up.gif" alt="" />. Another kool thing would be to put Gods in the game too. Like in Greek mythology, a God appears to the player (whether in disguise or in actual form) and talks to him, drops him hints about things, constantly helps, or hurts the player, trys to trick the him to his death.

Another thing that Id really love to see is providing the player with ways to beat the creatures/beasts in the game by other means other than fighting. Like being able to dig deep holes and covering them up as traps or something. Or making a creature invulnerable to everything except to only one certain way in which it can be killed(which the player has to figure out).

Ohh and guys for heavens sake, put some of our old acquaintances from <img src="/ubbthreads/images/graemlins/div.gif" alt="" /> into D2, besides Zandalor and the furry little cat. Like the two funny Orcs in the Wastelands and Kroxy.