Some of the documents mentioned that Sean did not want to kill Rick in the end. One of the documents stated that Sean had no intention of killing Rick during the duel. However, Rick understood this and felt that keeping Sean alive was meaningless to him and his team. In addition, there was also a document that mentioned that Sean had been very concerned and protective of Rick at the beginning. He had even used his own body to block the zombies and protect Rick. Therefore, based on this information, he could conclude that Sean did not want to kill Rick in the end.
One common plot is Rick trying to protect Diane from the dangerous multiverse he's involved in. It shows his more vulnerable side as he cares deeply for her.
You can try looking on some popular fanfiction websites like Archive of Our Own (AO3). It has a large collection of various fanfics, and there's a good chance you'll find some great rick x diane fanfic there.
Rick doesn't kill Negan in the comic series. The story takes many twists and turns, and their dynamic changes over time without resulting in Rick being the one to eliminate Negan.