One common theme is his struggle with identity. Given his complex character, many fanfics explore how he comes to terms with who he is. Another theme is his relationships, whether it be with friends, family or foes.
Well, there's a fanfic called 'Miguel Ohara: Redemption'. In this story, Miguel has to face the consequences of some of his past actions and tries to make amends. It's a great character - study type of fanfic. Additionally, 'Miguel Ohara in the Time Rift' is an exciting one where he gets caught in a time rift and has to figure out how to get back to his own time while also dealing with the strange things he encounters in different time periods.
The key element is his work at Alchemax. Another is his attempt to recreate the spider - bite. And of course, the accident during the experiment that changed his DNA.
Miguel Ohara is from the Spider - Verse. He was a brilliant scientist working at Alchemax. He was trying to recreate the spider - bite that gave others superpowers. But things went wrong during an experiment which led to his genetic alteration, giving him powers similar to Spider - Man. This origin is what set him on his path as a hero in his own right within the complex and multi - dimensional Spider - Verse.
I'm not sure specifically what a 'catherine cell' is in this context as the term is rather unclear. It could be a very specific or made - up concept within that particular story.
In the 'the black widow the catherine nevin story', Catherine Nevin was probably a person who had actions or a reputation that earned her the 'black widow' title. This could mean she was involved in activities that were not above board. It could be related to financial misdeeds, or actions that took advantage of people's vulnerabilities. Maybe she was at the center of a scandal or a criminal case where her actions were so notable that she became known as the 'black widow' in this particular story.
It could be a mysterious stranger she meets by chance. Maybe at a coffee shop, a guy who strikes up a conversation with her and shows an immediate interest in her life. He could be charming and different from Steve, which draws Catherine to him.
In the context of this fanfic, Catherine Rollins and Steve are likely characters created by the fanfic author. They could be original characters, or they might be based on existing characters from a particular show, movie, or book. Without more context, it's hard to say exactly who they are other than two individuals whose relationship is central to the story where Catherine makes Steve cry.
I'm not sure which specific 'Catherine' in science fiction you are referring to. There could be many characters named Catherine in various science fiction works.