I don't think it works like that. For one, I don't think EVERY character uses an Element. Secondly, Shikamaru's Shadow Manipulation is NOT a bloodline limit. Just a jutsu signature to their clan. Thirdly, there was no limit placed on the number of elements a person can use HOWEVER some people can use two elements simultaneously at one time, which is a bloodline limit (Such as in the case with Haku, who could use water and wind AT ONE TIME creating ice. Whether he could use them seperately, we're not sure of).