NHF – new heroes for Heroes V 3.1. Auto-translated

Will Kujin definitely have a bonus for them? Maybe her special ability works based on ID, not the "demon" characteristic.

I just checked. The specialization only works when there are racial Inferno creatures in the enemy army; their presence in Kujin's army, as well as the presence of other non-Inferno demonic creatures on the battlefield, does not affect the rage.
Her special ability turns out to be quite vague.

visual bug: in the hero menu, under the name Jir, there is an empty line instead of the line with the level, and then it says Knight,
also, for defeating an army of 50 demons, I received 180 additional experience points, and for defeating an army of 19 treants, I received 190 additional experience points, but in theory, it should have been much more.

Added after 58 minutes
I don't know for sure if it's related to the mod: I'm playing a game as Haven, with Jirai as the hero, on Hero difficulty, on the Legacy map. After about 2-3 weeks of the 1st month, the AI stopped developing. The only hero I see on the map is standing still, and the others haven't updated their armies for about 3 months, judging by the information in the tavern.

Added after 10 minutes
I started a new game and skipped 2 months of turns, and they are developing, so it seems to be an isolated case.

Found another unfinished feature related to Jira. During a battle against a hero, if the hero flees without losing a single creature, Jira receives bonus experience as if he had killed them all.
There's also another suggestion, but I'm not sure how feasible it is. To split the full version of the mod into modules that can be combined: 1) new heroes (which already exists); 2) upgrades for existing standard heroes, adding new starting spells; 3) a new wheel; 4) reworked starting skills and abilities for standard heroes to match the new wheel; 5) the same as 4, but for new heroes; 6) all other changes related to spells, starting stats, etc.; 7) after adapting the NCF, a module with new creatures.

The new wheel is not compatible with the heroes as a module, because the starting conditions are different.

The enemy hero lost all of his creatures. You received credit for them. I think that's how it should be... Seriously, you defeated his army, scattered them across the forests and fields, killed whoever you found, and so on. You received experience for it, which is fair.
However, if this happened during a ransom, then yes, that would be unpleasant.

It's fair from a logical point of view. But from a gameplay perspective, since no experience is given at all when the opponent's hero flees without losing a single unit, it seems unfair to other heroes who, in Jira's place, wouldn't get anything. On the other hand, this can be considered a feature of this hero, and it can be argued that it should be this way, as it doesn't really create any major imbalance.