Hypothetically: which units from Heroes of Might and Magic II would you replace?

I would also replace the peasants with something like a militia (they could even keep the same name), at least with 2 hit points and 1-2 damage, and a slow speed. I understand that 4 castles were simply copied, but in the original, building Druids required 10 mercury, which they considered too expensive in the second game.
The Necropolis, with its powerful vampire lords and dragons, has been slightly weakened by the addition of archers, especially those that haven't been upgraded, and their speed is not very high. And finding 10+10 resources is not that easy.