RTF is a global modification that replaces all towns in the game.

Actually, who will have which heroes?
Elementals - a Necromancer hero
Chimera - an Elf, as I understand
Fortress - a Gnome
Orcs - Orcs should probably be on Orcs))
Haven - you can use humans, just repaint them in green armor and give them a helmet with one horn (Unicorn Empire)
Necropolis - as I understand, the heroes there are on angels
Sanctuary - there are already heroes in the mod, but you can make heroes on Kenshi generals, which we removed
Lizards - you can use Dark Elves (they ride on lizards)