Of course, they will be useful! Do you have the names of these characters?!
Posts from NHF – new heroes for Heroes V 3.1.
In this game, you could choose a hero's portrait, but you came up with the name yourself. So, you could take someone like Laslo or Axel and call him Sir Vasya.
You can find a name generator for D&D.

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Неудачное планирование ведёт к неудаче ...
NCF - мод, добавляющий дополнительных существ в HeroesV 3.1
The point is that my esteemed comrade Dyrman and I tried to adhere to the principle that all heroes that will be added should, if possible, be from the Ashan lore. In principle, almost all Ashan heroes from other parts of the game have already been added, some in NHF, and some in NHF_E... the point is that there are still heroes who are mentioned in the Campaigns, etc., but there is no information and/or portrait about them, and it would be really cool if a real portrait could be found for such heroes (after all, all these different games in the world of Ashan were developed under the auspices of Ubi, i.e., the direct author)!
There are heroes with names, and even with some kind of short biography.
https://mightandmagic.fandom.com/ru/wiki/%D0%A1%D0%BF%D0%B8%D1%81%D0%BE%D0%BA_%D0%BF%D0%B5%D1%80%D1%81%D0%BE%D0%BD%D0%B0%D0%B6%D0%B5%D0%B9_Duel_of_Champions
P.S. By the way, on the map "Dragon Steel," it's displayed as a pile of sulfur, and "Twilight Steel" is displayed as a vial of mercury... but overall, I like it a lot, I really like it! The idea of making the appearance of buildings closer to those in games 6/7, I personally like it a lot, with the possible exception of the "Lumber Mill"...
P.P.S. And what does PEST mean?!

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Неудачное планирование ведёт к неудаче ...
NCF - мод, добавляющий дополнительных существ в HeroesV 3.1
Added 5 minutes later
the map patcher doesn't work; it seems like I'm patching the maps, but the hero abilities don't work on them.
I did everything as instructed, the map appeared, but the hero abilities from your mod don't work in the game. For example, Sandro's spell power doesn't increase with each level. I uninstalled version 0.89 and re-downloaded 0.88, and everything works.

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Неудачное планирование ведёт к неудаче ...
NCF - мод, добавляющий дополнительных существ в HeroesV 3.1
So, where is NHF written in the bin folder?

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Неудачное планирование ведёт к неудаче ...
NCF - мод, добавляющий дополнительных существ в HeroesV 3.1
I did everything as instructed, the map appeared, but the hero abilities from your mod don't work in the game. For example, Sandro's spell power doesn't increase with each level. I uninstalled version 0.89 and re-downloaded 0.88, and now everything works.
NHF 0.90 : NHF - группа в VK
Карты для HeroesV:
Путешествие , Условие крови , Рука судьбы.Часть 1: В поход , Рука судьбы.Часть 2: Отчаянье , Рука судьбы.Часть 3: Восхождение , Стойкость
Абсолютная власть , Иду на Вы! , Корона Ургаша , На задворках
Мир надо уничтожить... Чтобы создать свой...
I launched NHF version 0.89 on my laptop, as usual with the main hero Kaspar, and noticed that he had lost his unique model – I fixed it, a small fix for the hero of the "Necropolis" faction, Kaspar, attached!
P.S. By the way, on the map "Dragon Steel," it is displayed as a pile of sulfur, and "Twilight Steel" is displayed as a vial of mercury... but otherwise, I like it very much, I really like it! The idea of making the appearance of buildings closer to those in games 6/7, I personally like it a lot, with the exception of perhaps the "Sawmill"...
P.P.S. And what does PEST mean?!
NHF 0.90 : NHF - группа в VK
Карты для HeroesV:
Путешествие , Условие крови , Рука судьбы.Часть 1: В поход , Рука судьбы.Часть 2: Отчаянье , Рука судьбы.Часть 3: Восхождение , Стойкость
Абсолютная власть , Иду на Вы! , Корона Ургаша , На задворках
Мир надо уничтожить... Чтобы создать свой...
The simultaneous turn mode in online play does not turn off even after a connection interruption.

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Неудачное планирование ведёт к неудаче ...
NCF - мод, добавляющий дополнительных существ в HeroesV 3.1
So, PEST is for playing against human players?!
I'll check Kaspar today, but I remember that I had no problems with objects or resources.
NHF 0.90 : NHF - группа в VK
Карты для HeroesV:
Путешествие , Условие крови , Рука судьбы.Часть 1: В поход , Рука судьбы.Часть 2: Отчаянье , Рука судьбы.Часть 3: Восхождение , Стойкость
Абсолютная власть , Иду на Вы! , Корона Ургаша , На задворках
Мир надо уничтожить... Чтобы создать свой...