Which skills are best for a hero?

There is no randomness in recruiting neutral creatures. As I said, at the beginning of the mission, it is rigidly determined which group will join and which will not. After that, everything depends on artifacts and some other parameters described in the manual. In addition, there are also hidden parameters that are not described in the manual, but some people know about them. That is, in fact, at the beginning of the mission, the groups of neutral creatures that are potentially ready to join are determined, and then everything depends on your ability to do so. This is the skill I meant.