But I've heard that rivalries won't be the same vice versa. For example, when playing as Sackboy, the rival seems to be Big Daddy, but when playing as Big Daddy, it could be someone else.
I would just go out on a whim here to say it's the other way around FOR SURE. As the reasoning they say is that Little Sister finds Sackboy cuter than Mr. Bubbles which makes him mad. I would think that he would hate sackboy then. However, Sackboy doesn't necessarily have any negative feelings toward Big Daddy