Stefan could also play a role. Since he and Caroline are friends and he has a history with Klaus, he might step in to try and stop the marriage. He could try to negotiate with Klaus or find some other way to free Caroline.
Caroline in the 'caroline found story' could be anyone really. She could be a scientist who found a new species or a new scientific principle. Maybe she's a writer who found inspiration for her next great novel. Or she could be a mother who found a way to better connect with her children. Without more details about the story, we can only speculate about who she might be, but she's clearly the central figure in this story about discovery.
I don't have enough information to determine who Caroline is in this story. She could be an ordinary person with an extraordinary secret, or a fictional character created for a specific narrative.
Since we don't have much information about the 'captured caroline' story, it's hard to say exactly who Caroline is. She could be the protagonist, a victim, or a key figure in some sort of adventure or mystery.
Without more information, it's hard to say who Caroline and Nicolas are exactly. They could be ordinary people with an interesting story, or they could be characters in a fictional narrative.
In the comics, Daredevil's marital status varies. But one notable character he marries is Elektra Natchios. However, the comic universe is complex, and there might be alternate story arcs with different spouses.