One idea could be creating an OC (original character) who is a powerful mage from a hidden dimension. They could have unique powers that disrupt Thanos' plans in unexpected ways. For example, their magic could nullify the power of the Infinity Stones temporarily.
Another interesting approach is an OC who is a shapeshifter. This character could infiltrate Thanos' army by taking on the form of one of his minions. They could then gather crucial information and pass it on to the Avengers, giving them an edge in the battle.
One idea could be Superman teaming up with the Avengers in a way that defies the normal rules of their universes. Maybe he has a unique power that helps them against Thanos, like his super - breath freezing Thanos' army.
One idea could be exploring how the remaining heroes deal with the loss of half the population on a personal level. For example, Iron Man could struggle with survivor's guilt and pour all his energy into finding a way to reverse it. Another could be about the new friendships formed among the survivors as they realize they have to rely on each other more than ever.
One idea could be a crossover with the Harry Potter universe. The Avengers could travel to Hogwarts in search of a magical relic that could help them in the fight against Thanos. Maybe Doctor Strange uses his magic to open a portal to Hogwarts and they team up with the wizards to defend the relic from Thanos' minions.
One idea could be exploring the backstories of the minor characters in more depth. For example, showing how the Wakandan warriors trained and what their lives were like before the big battle. Another could be a what - if scenario where Thanos actually had a change of heart at the last minute. Maybe he saw the beauty in the universe he was about to destroy and decided to stop.
A possible plot could be that Deadpool somehow gets his hands on one of the Infinity Stones before Thanos does. This attracts the attention of Thanos, who then sends his minions after Deadpool. Spider - Man has to protect Deadpool while they try to figure out what to do with the Stone. This leads to a series of wild adventures and battles, with the two heroes learning more about each other and growing as characters.
One interesting idea could be an original character (oc) using the Infinity Stones in unexpected ways. For example, an oc might use the Time Stone to reverse a great tragedy in their world. Another could be an oc having a unique connection to the Stones, like being able to sense their power from a great distance.
Another interesting concept is an oc who is not a skater initially but gets drawn into the world of 'S' because of a personal connection. Maybe they are a photographer who wants to document the amazing skating feats at 'S', and through that, they end up learning to skate themselves and becoming part of the community. They could face challenges like not being accepted at first due to not being a 'true skater', but gradually earn respect.
One idea could be that Spider - Man discovers a hidden power within himself during Infinity War that allows him to turn the tide of the battle. Maybe he can communicate with the Infinity Stones on a deeper level, using his spider - sense to detect their weaknesses and strengths.
One idea could be that Spider - Man discovers a hidden power within himself during the Infinity War. Maybe he has a unique connection to the Infinity Stones that no one else realizes. This power could help him turn the tide in some crucial battles.
One idea could be exploring the backstories of the characters in more depth before the events of the trailer. For example, you could write about Thor's journey after losing his eye and how it led him to where he is in the trailer. Another idea is to create a different perspective on the villain, Thanos. Maybe show his internal struggle or his reasons for wanting the Infinity Stones that are a bit more complex than just pure evil. You could also focus on the relationships between the Avengers, like how Iron Man and Captain America might have reconciled off - screen before coming together to face Thanos.