Spiderman could meet an old enemy who has changed sides. Say, the Green Goblin, who now wants to help Spiderman after having a change of heart. This encounter during the field trip could be a very interesting plot twist in the fanfic.
In a fanfic about a Spiderman field trip, it could be that the field trip is to Oscorp. There, Spiderman discovers some unethical experiments. He has to then figure out how to expose the wrongdoings without revealing his identity to his classmates who are also on the field trip. He might use his wits and web - slinging abilities to gather evidence secretly.
He might meet Pepper Potts. She could be showing the students around some parts of the tower and give them some insights about how Stark Industries operates.
There's a chance Ricie will meet Santa Claus himself at one of the stops. It could be at a small local shopping center where Santa is taking pictures with the kids. Or Ricie could meet some friendly elves who are helping to spread Christmas cheer. Also, Ricie might come across some carol singers on the street corners of a small town. They could join in and sing some classic Christmas songs together.
He could meet powerful mages from other guilds. These mages might have different styles of magic that Natsu can learn from.
Peter would likely be in awe of everything and constantly asking Tony questions. Tony, in his father - son role, would patiently answer, with a bit of his usual sarcastic charm. For example, if they see a new piece of tech, Peter would say 'Mr. Stark, how does this work?' and Tony would reply 'Kid, if I told you all my secrets, where would the fun be?'
In the fanfiction's training trip, Naruto may encounter some spiritual beings. These beings could be related to the origin of chakra or some long - forgotten ninja legends. Interacting with them would be a very different experience for Naruto. He would have to use not only his physical skills but also his wits and understanding of the ninja world's deeper mysteries to communicate with them. This could lead to a major transformation in his ninja journey, as he delves deeper into the spiritual side of the ninja arts.
He could meet other sannin. Maybe he stumbles upon Orochimaru who is on some secret mission. This encounter would be full of danger and Naruto would have to use all his skills and wits to survive.
He could meet some old enemies who have changed their ways. For instance, some of Orochimaru's former minions might have decided to start anew and cross paths with Naruto. Or perhaps he meets a hermit ninja who has been living in isolation for years and imparts some valuable wisdom to him.
He could meet an old hermit ninja who imparts his wisdom and knowledge to Naruto. This hermit might have been living in seclusion for years, but seeing Naruto's potential, decides to teach him things not found in normal ninja training.
Naruto might meet some foreign ninjas from far - off lands that have completely different fighting styles. These ninjas could teach him new ways to use his chakra and improve his combat abilities. He may also encounter some mysterious hermits living in the mountains or forests who possess great wisdom and unique jutsu. They could guide him on his journey of self - improvement and give him valuable advice on how to become stronger as a ninja.