Haha, no. CC is supposed to be a simple game, we don't need guilds or quests or anything. Get guy from point a to point b, don't die, and save the girl(s). Simple. It doesnt have to be a freaking RPG, it's a hack n' slash with some rpg elements. Shields, ehh, kinda interesting but, man, thats like a animal orb you can carry. I would think Any DLc should just expand on already existing idea's, not introduce new ones.
My idea for a DLC character is funny. I thought about it during PE. Ok, who's played minecraft? Super meat boy for the PC? well, then you might be familiar with MR. Minecraft, AKA the default skin you have when you play minecraft. Now, i would pin him as sort of a re-skinned necromancer, imagine this:
He would start out with a diamond sword
His splash would be a row of lava blocks appearing and spreading (think of the necromancer's skeleton hand splash attack)
His projectile would be launching a creeper (SSSSSSSSSSSSSSSSSSSS) (Also, think of the exploding skeleton, same concept)
His magic jump would be a tower or blocks pushing him up (a reference to "towering", a technique where you jump and place blocks under you to create a tower.) (Think of the blue knights ice fist)
And finally, He could have re-skinned arrows, and his shovel could be the diamond shovel. It would be funny if he got a Ghast animal orb could shoot flaming snowballs.
I know, never going to happen, but i had fun thinking of all the aspects of the character.