We can further discuss your leaders and units. Because I like the idea that decks have themes. I'll also get a base character sheet up. Woo! This is exciting.
And you know what I want. A deck of light and dark themes.
I demand an adorable theme. :p
2) What brings the protagonist together is that they all acquire in some mystery way a World of End card. They are a card that exist nowhere in the original print of the cards that currently exist. That have mystical powers. That tie to them an ancient tale. They will acquire a Warrior of World End as an alternative persona, like a ghost that takes over a host body when they duel or when there is an adventure that is going on or some kind of connection.
My curiosity drives me to ask: Do they all obtain these cards in different mystery ways? Or do they just wake up one day with them on their face like "what the hell? Where'd this come from?" Just a random example, as I'm highly doubting that's how it will actually happen xD