What if Dark Souls 2 scanned your memory unit and the final boss of Dark Souls 2 had abilities similar to any character you beat the game with that was still on your memory unit?
Certain abilities would of course have favor over other ones, the final boss would for example favor maybe the Great Club over rapiers or greatswords, for example, but it would be a souped up interpretation of your experiences with Dark Souls, magic, pyromancies, etc included.
There would of course be a template for players that never beat/played dark souls, but presuming dark Souls 2 happens in the future, I'd love to enter a fog gate and hear a jarring, warped interpretation of Gwyn's theme with the words "Chosen Undead" for the boss name.