Generally, Eddie Brock survives in the comics. However, there have been some complex and alternate storylines where his fate is less certain or temporarily in jeopardy.
They would become even closer. The shared responsibility of having a baby would strengthen their bond. Eddie would be more protective of Venom, and Venom would be more gentle towards Eddie, knowing they are in this together for the sake of their future child.
One common theme is redemption. Since Eddie Brock has his own complex past, the OC often plays a role in his journey towards redemption or self - discovery.
Rather than looking for this kind of fanfic, I would recommend seeking out fanfic that delves into Eddie Brock's relationships with other characters in a more platonic or heroic sense. For example, his relationship with Venom and how they team up to fight evil.
Well, Eddie Brock could initially be seen as a threat. His symbiotic nature might make the Avengers cautious. Maybe Spider - Man, if he's part of the Avengers in that fanfic, would have a special reaction since he has his own history with Venom (Eddie Brock).
One possible plot could be Eddie Brock's symbiote having some sort of connection to a new threat that the Avengers are facing. Maybe the symbiote has knowledge of an alien invasion that's about to happen. So, Eddie Brock teams up with the Avengers to stop it. They might initially be suspicious of him because of the symbiote's wild nature, but over time they learn to work together.
One great Eddie Brock OC fanfiction is 'Eddie and the New Ally' which explores an original character's journey alongside Eddie Brock. It has some really interesting character dynamics.
Think about his relationships. His friendship with other characters in the Spider - Man universe. You can create a story where he teams up with Spider - Man to solve a mystery that involves both of their nemeses. Build the story around their different approaches to problem - solving and how they learn from each other.