Some fanfictions also revolve around the idea of sacrifice. In the harsh world of 'The Walking Dead', there are situations where one might have to sacrifice for the other. This theme can be really emotional and heart - wrenching. It shows the depth of their love and commitment to each other. And then there are those that deal with the theme of hope. Despite all the horror and chaos, they find hope in their relationship and in the possibility of a better future, which is a really inspiring theme in the fanfictions.
You can try fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. They usually have a large collection of 'Walking Dead' fanfictions, and you can specifically search for ones related to Aaron and Eric there.
Michonne does die in the comics. The circumstances surrounding her death were quite dramatic and had a significant impact on the story's progression. It happened during a major conflict with other characters.