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I like almost all the heroes; each has its own advantages and disadvantages. I can only highlight those who already have a diploma at the start; it's not interesting to play with these heroes, and I consider them cheaters. It's more interesting to get a diploma during the game, especially when you observe your opponent (at the moment of receiving the diploma) when playing in Hot Seat mode. I would also add Mullich to this list; he's a nuisance for the opponent. My favorite is Tantalus, of course.