Auto-translated
Based on appearance:
Heroes 1: I played for 5 minutes.
Heroes 2: Please don't judge, but I don't like any of the creatures there.
Heroes 3: I like almost all the creatures. Phoenixes aren't very appealing: they look like yellow-beaked chicks. I especially like azure dragons (of course!), golden dragons, archmages, thought elementals, and ifrits.
Heroes 4: Gargantuars were okay, and dragon golems were original. I'm mostly neutral or have a negative opinion about the rest.
Heroes 5: I liked the chubby peasants, chubby zombies, chubby minotaurs, the original ghosts, ent, and angels: they are so light and airy (if only their swords were a little smaller :)), and the dragons are also good (everyone complains that they are emaciated, but I think that's good. At least you can believe they can fly :)), and the druids. The stools look stupid, I don't really like the yeti unit (just because they didn't make one :)), or the dusk witches.