If I recall from playing NWN demo long time ago, in NWN you have one hero that can level up and some sort of generic helpers/companions without possibility of developing them. So you could not create a party like in Baldur's Gate and Icewind Dale series or Temple of Elemental Evil, am I rigth?

Yep. That's pretty much exactly right. There were a few quests and stuff you could do to improve your henchperson if I remember correctly, but basically they got stronger as the story progressed and you used them, but not in any way you could customize. I think in Hordes you could bring two with you at once instead of just one.

You directly control one character. Along the way, you meet others willing to help you, usually for a fee (they're mercenaries). You can give them orders, but you do not directly control them.

Starting with Shadows of Undredtide, you have a degree of influence over how these "henchmen" (official term) develop, and you have access to their inventory so you can equip them with whatever you want.

In the official campaign and Shadows of Undredtide, you can only have one henchman at a time. In Hordes of the Underdark, you can have two.

User-created modules may vary the henchman system, including their number and abilities (I played one module with 3 henchmen, two of which could summon creatures. As a druid with both an animal companion and a summoned elemental, that ended up with a party of 8). But as far as I know, it is impossible with the Neverwinter Nights engine to directly control more than one character.

I just started a new game using one of the built-in characters instead of creating my own and as soon as I hired my first hench(wo)man, I talked to her and was presented with the option to make her level up. I couldn't control what particular stats, skills, etc. she upgraded, but she was definitely able to level up and improve (a lot). She also mysteriously acquired new equipment the moment after she leveled. She kept those stats and equipment even after I fired her. So while you can't personally guide their development, they do actually develop on their own.

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