Tamaki would probably be in awe of the Avengers at first. He might try to imitate their heroic poses and grandeur, thinking it would make him seem more appealing. He could also be a bit intimidated by their power, but would quickly try to befriend them. Haruhi would be more practical. She'd probably be curious about how they got their powers and if there was any scientific explanation behind it all.
Mori would be quiet as usual, but would be on guard. He would observe the Avengers closely and be ready to protect the other OHSHC members if needed. Honey - senpai would probably be excited to have new people to share his cakes with. He might not fully understand the danger the Avengers often face, but he would be happy to have them around for the company.
The twins, Hikaru and Kaoru, would likely play pranks on the Avengers at first. They might switch Thor's hammer with a fake one or something similar. But as they got to know the Avengers better, they would start to respect their abilities. Kyoya would see the Avengers as an opportunity. He might try to figure out how to make a profit from their presence, like selling exclusive merchandise related to their visit to the OHSHC world.
They would probably be very surprised. Some might laugh at the creative ideas in the fanfiction.
Some would be intrigued. Captain America, being an open - minded person, might be interested in seeing different interpretations of their team dynamics. He could even gain new insights about his relationships with his fellow Avengers through the fanfiction.
Thor would likely be the most affected. He has a history with Fenrir as it is from Asgardian mythology. He might be cautious at first, but also feel a sense of kinship. Iron Man would probably be all about analyzing Fenrir, trying to figure out its weaknesses and strengths. Captain America would be on guard, ready to defend his team, but also open to the idea of Fenrir not being an enemy if proven so.
Well, when the Avengers first encounter Sephiroth, they'd be quite surprised. Tony Stark would crack a joke to ease the tension a bit but still be very aware of the danger. Steve Rogers would stand tall and be the first to step forward, showing no fear. Thor would grip his hammer tightly, ready to defend. Bruce Banner would be worried that if Hulk gets involved, it could be a very chaotic battle. The female Avengers like Black Widow and Scarlet Witch would be sizing up Sephiroth, trying to find any chinks in his armor. They'd all be on high alert and start formulating a plan to either defeat or contain this unexpected and very powerful new arrival.
The characters might also get confused. Fanfictions often have their own unique plotlines that can be quite different from the official story. So when they see these strange twists and turns, like Thanos suddenly becoming good in the fanfiction, they'd be scratching their heads and trying to figure out what's going on.
Percy would be really conflicted. On one hand, he's used to following the orders of the gods, but on the other, he knows the Avengers are heroes. He'd probably feel guilty about banishing them. The Avengers would be confused and angry. They'd try to figure out who Percy is and why he's banishing them. Iron Man might try to use his technology to find a way out of the banishment, while Captain America would be more focused on trying to reason with Percy.
Thor would be a bit more straightforward. He'd probably see the Spider - People as brave warriors. He might be a bit confused at first about the multiverse concept but would quickly accept it. He'd be like 'These small heroes have great courage, much like the warriors of Asgard.' And he might offer to train them if they ever met. He'd also be entertained by the humor in the Spider - Verse, like the interactions between Peter B. Parker and Miles.
Hawkeye would be on high alert, remembering how Loki had mind - controlled him in the past. Bruce Banner would be a bit more reserved, worried that any sudden outburst of anger could bring out the Hulk. Loki, on his part, would be playing his own game, trying to see how he could fit into this new group dynamic. There would be a lot of tension and potential for growth in these character interactions.
Tony Stark would probably be very intrigued. He'd want to study Loki's Jotun form, maybe even make some snarky comments about his blue skin. Steve Rogers, on the other hand, would be more cautious. He'd be ready for any potential threat that Loki might pose.
Captain America would probably be very respectful of the demigod's world. He's used to different cultures and values, so he'd likely try to understand their ways. Thor, on the other hand, might see some similarities between the gods in the fanfic and the Norse gods he knows. He could either be amused or a bit put off by the differences.