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It is feasible, but poorly balanced (it heavily depends on the map). Also, it will require intercepting a huge number of objects using scripts.
This is for Necropolis:
Charity (Necropolis)
Once, Charity was one of the rebellious baronesses in the Duchy of the Hound. She rode a black horse, wielding an unusual blade, and her banners featured bats. Her rebellion was suppressed, but she miraculously escaped to the neighboring Duchy of the Bull.
One day, at a fair, Charity saw a familiar, unusual blade in a weapons merchant's shop. When she inquired, the old man confessed that the sword belonged to some noble person. Charity grabbed the blade and cut the poor man in half.
Fleeing from the Holy Empire to Erathia, Charity became a powerful rider whose name commanded respect among necromancers.
After the defeat of Markel, Charity left Erathia, vowing to return to the Empire and finish the task she had started long ago.
Special: Sharpened Blade – the hero receives +1 to attack for each captured building.
NOTE: Ideally, the figure should depict a female warrior with a sword.