On ins Creed Brotherhood can you play with the Multiplayer Characters on story mode?

Ok i just got this game a few days ago, and so far im kinda dissapointed about how the game is made. The moves, and gameplay is excellent no doubt. But my concern is, do i have to play with the same person over and over again during story mode, (BESIDES DESMOND), like can i play as another character like in Multiplayer mode, Because it would be nice to play as The Smuggler, or that joker character. OR am i stuck with the regular in, (Ezio & Desmond) throughout story mode. And i think its not cool that we cant play multiplayer unless we are online. IF there is a possibility that we can play as any character on story mode, and if there is a possibility we can play multiplayer offline please tell me.! I REALLY APPRECIATE IT.!!