Oversun
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My opinion is this: you have already added many interesting heroes. Start creating unique models for them; that's what's really missing.
From other universes (Winx, Conan, Star Wars, etc.), heroes should NOT be added under any circumstances! Unless it's from Naruto (sarcasm).
But overall, the mod is great! Well done!
P.S. If it's possible to rebuild a city using scripts, could you create heroes for a ninth faction, for example, Elementals, who would have this ability? After all, it's possible to create a city that won't appear in the list of factions (the very first semi-mod for Nag).