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.
David was this young lad who was taking care of his father's sheep. He was not from a military background but was chosen by God. In the story against Goliath, he showed remarkable bravery. He trusted in God's power and his own skills, like his ability with a slingshot, which ultimately led to his victory over the giant.
Robin is a complex character with the ability to read the Poneglyphs. Si, in the context of this fanfiction, might be a character with a unique power or skill. It could be that Si is a healer and helps Robin when she is injured on Ohara. Or perhaps Si is a storyteller and shares tales with Robin that give her new clues about the history she is seeking.
In this fanfiction, perhaps Si and Robin could share their knowledge. Si might be a new character who is intrigued by Robin's archaeology knowledge. They could explore the secrets of Ohara together.
I'm not sure who David Fuller is in this story. There are so many people named David Fuller. He might be a character who had an important role in a particular event or a person with a unique personality in a family or social group. But without more context, it's difficult to be precise.