Just thinking later it might be cool to have some sort of traps that you can lay.
Traps rule.
Hmm...perhaps we need a Thief or Engineer character, eh? Definitely doable.
I like the idea of adding another character: "Engineer" (in most games, that's the name of the character who lays mines etc)
"Theft" could be character that can steal cards (card cost = 1). One of his other ability could be "Stealth" which can be useable anytime (makes him invisible) for one turn, and have a cool down of 2 turns after its use.
"Healer" = low str and low hp and can heal a target
"Tanker" = high def and health, but very low strength. Hrmm... what ability could he have?