One great Phil Coulson fanfiction is 'Agent Coulson's New Mission'. It explores an alternate storyline where Coulson is sent on a secret undercover mission that wasn't in the original series. Another interesting one is 'Coulson's Team Reborn' which focuses on Coulson rebuilding his team in a different way after a major setback. And 'The Coulson Chronicles' is also a popular one that delves deeper into Coulson's personal backstory and how it affects his actions in the SHIELD world.
Well, AO3 is a great place to start. It has a very user - friendly interface and a lot of tags to help you narrow down your search for Phil Coulson fanfiction. You can also try Tumblr. There are often posts about fanfiction, and some users even write and share their own short Phil Coulson fanfics on their blogs. Additionally, some dedicated Marvel fanfiction forums might have some great Phil Coulson stories as well.
Another theme is the idea of friendship across different universes. Coulson and Harry Potter or other characters from the Harry Potter series form bonds. They learn from each other's strengths and weaknesses. Like in some stories, Coulson teaches Harry about strategic planning from a non - magical perspective, and Harry shows Coulson the power of magic in solving problems.
One great 'Harry Potter Phil Coulson fanfiction' is 'The Wizard and the Agent' which combines the magic of the Harry Potter world with Coulson's sharp skills. It has an interesting plot where Coulson gets involved in the wizarding world's affairs in a very unique way.
One good example could be 'The Unlikely Alliance' where Coulson's strategic mind and Stark's genius come together in a unique way. Coulson tries to court Stark's attention for a new Avengers - related project. Another could be 'Courting the Genius' which focuses on Coulson's more personal attempts to befriend and court Stark outside of the superhero business. There's also 'Stark and Coulson: A New Dynamic' where Coulson uses his charm to draw Stark into a new partnership while also having some underlying romantic undertones.
One popular trope is the 'enemies to lovers' scenario. They start off at odds with each other in the story, maybe due to differences in their leadership styles or personal beliefs, but then gradually develop feelings. Another is the 'hurt/comfort' trope. For example, if one of them gets injured during a mission, the other takes care of them, and this brings them closer.