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Nomads and spearmen were in all parts except for the 5th. Elementals were in all except the 1st. Dragonlings are a classic; how could we do without them? They just changed in all parts, except for Heroes of Might and Magic III and Heroes of Might and Magic V, where they remained relatively stable. They forgot about rogues, and that's unfair; they were always there (let's say that in the 5th part, they were replaced by assassins).
Druids, medusas, hobbits, rocs, and death knights were present in 3 out of 5 parts.
P.S. Congratulations on your 500th post, Slonysh! Now you've transformed from a metalhead into an old mage:D

Барон "Vampires"
Отдай свои прошлые сны,
В сомненьях себя обрети,
В бешеном танце душа кружится!
Не думай, что будет потом,
Здесь и сейчас мы живем,
Стань хоть на миг сам собой, слышишь!