Anyway, thanks to everybody who voted in our poll. The results were:
The results, IMO, are hardly surprising. Vampires, who came in first, are some of the most common cards seen in many decks. People like them because they deal out a lot of damage and consist of characters that fight well at close range. The Martial Artists came in second. The Martial Artists have Yoshiro, who is probably the most used finisher character, and Rumiko, who can deal out lots of damage and switch out. The other Martial Artists aren't used quite as often as Rumiko and Yoshiro, because it seems that people think that the other cards are pretty weak (especially Amaya and Onimaru). The Amazons followed in third. Many people like to have versatile characters who are useful at both ranges. The Amazons are generally single-ranged, which is most likey why only 1 out of every 5 people think they're the best set. Villagers came in last probably because they're niche characters. They're not really general-purpose fighters, but rather characters brought in for certain moments in the game.
This message brought to you by EsIeX3, and thanks again for all the votes!