Different types of heroes in Heroes 2.

This topic is created for discussing various types of heroes in Heroes 2. Naturally, the topic of primary and secondary skills will also be touched upon here – and this will not be considered off-topic as long as it is related to the main topic. Let's discuss!

Added after 4 minutes
Regarding scouting, one can argue about it. For 6 years, I considered it an "unnecessary" skill, until I suddenly changed my opinion about a year and a half ago!