<Ivor>
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Can't you start with the same heroes?
For this to happen, the same factions and starting heroes of the same class must be selected. And, of course, you need to answer "yes" to the question in the pop-up window.
The hero for both players will be the one selected for the red player; the blue player's hero will have their skills, specialization, and portrait changed. If you choose a hero of a different class for the blue player, you won't be able to turn a mage into a warrior, and vice versa: there are different probabilities for obtaining primary parameters and secondary skills.