NHF – new heroes for Heroes V 3.1.

Why is a huge hero needed (the Overlord sends his regards)?

Why immediately huge? The Overlord is quite large, of course, but if the hero is smaller than a Lich, it won't look good.

Moreover, there is always an aura around the hero from the Faction he belongs to, so you can't just make him "invisible."

The aura is just an auxiliary element. For example, auras are not very visible in the snow. The hero needs to be made so that he is noticeable even without auras.

Besides, there is Biara, whose size isn't that different.

Her model is only in one scenario and in the Campaign (where you play against her). There are also various vampires and Alarics, yes. But it turned out to be mediocre. The only more or less successful small model I can name is Nicholas: he looks visually larger. Although, it still could have been better, for example, if he was put on a mount.

And, as a follow-up, heroes on horses are not that large (without the horses themselves), so a small hero size would be quite logical.

There is no logic here. The buffalo under the Barbarian is comparable in size to an entire building on the global map. If a hero in the form of a creature is visually slightly larger than this creature, no one will pay any attention to it, but the gameplay will increase dramatically.

Besides, you yourself wrote that the hero's appearance is not very important to you, so what is the problem?

I didn't write that; you're confusing me with someone else. I would actually be all for each hero having a unique model. But it's better if it's not just a "model for the sake of a model," but so that the game as a whole doesn't suffer from it.

There will be no non-mounted hero models, except for demons, in NHF.

Well, the mod creator's word is law