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I tried playing as the Demons ("hero"). It was a drag. No, to be more precise, it was utter darkness. I restarted five times with Kaan, but this hero is terminally ill. He suffers a lot and doesn't live long. By the time the first AI main hero (Necromancer level 17) arrives, I never managed to level Kaan above level 12. In all cases, only the "attack" parameter grows for him, "spell power" remains at 1, rarely reaching 2. So, Kaan's special ability is purely decorative. Also, the AI seems to be able to read my posts. The most common random spell before battles was "grief" and "weakness." During the entire game, "plague" appeared only once, and "disrupting ray" appeared three times. Once, I found Lestos in a tavern. I took him. Compared to him, Kaan is like a hand saw against an angle grinder. The peculiarity of the Demon castle is that there is only one ranged unit, and the rest are melee units. Therefore, when the AI main hero arrives, the castle walls don't help much, and you have to fight against superior forces. The gate cannot compensate for the difference in the number of troops of the besiegers and defenders. The Necromancer brought an army to the castle that was 1.5-2 times larger than the Demon army, and the imps, sticking their tongues out, quickly ran into their last battle. A quick start is necessary on the map. Kaan, in his current form, can provide it, but only if too many conditions are met. It is necessary that two native heroes appear in the tavern on the first day. The protection of objects should mainly not be ranged. There should be sulfur among the random resources near the castle. Even when everything works out, he can only fend off the first AI main hero. The second hero will crush him like a bug. It is uncomfortable to play the map with the Demon castle, and hopeless with Kaan. Groll is a little better, and Daleb lasted the longest. She reached level 26, but the economic reasons for developing the castle also ruined her.
P.S. I looked at the new Rupert. He is a good hero, but lacks "spark." As someone here already called him, he's a "chopper." It's simple to play with him. The main thing is that there is almost the same standard hero in the Human castle, and therefore playing with him is not very interesting.