Jenna is obviously a key character. You can explore her character further, like what if she had different reactions to becoming 30 in the fanfiction? Maybe she's more scared or more excited than in the movie.
Matty is also a great character to focus on. You could write a fanfiction where Matty has his own magical experience related to Jenna's transformation. For example, he could get a glimpse of their future together or apart.
In The Mummy 2017 fanfiction, I think the character with the most potential is the mummy. Her character has so much mystery surrounding it. You can write about her from different perspectives, like as a vengeful spirit or as a victim of a cruel fate. Then there's the female lead. She can be developed more in fanfiction, perhaps having a more in - depth relationship with the mummy, either as an enemy or as someone who tries to understand her. And don't forget the villainous characters. They can be made more complex, with their own motives and backstories that tie into the overall story of the mummy.
I think Myrtle Wilson is an often overlooked but very interesting character for fanfiction. Her tragic end in the original story can be rewritten. We can explore her dreams and desires more fully. Also, Tom Buchanan's family, like his parents or siblings, if they were introduced in fanfiction, could add a new dimension to the story. They might have influenced Tom's personality and actions, and exploring this could lead to some very engaging fanfiction stories.
In my opinion, Tito is really interesting. His small size but big heart can lead to some great storylines. Maybe he has a secret talent that he's been hiding from the others. Georgette is also a character full of potential. Her glamorous life as a show dog could be contrasted with the street - life of Dodger and the gang. We could see how she learns to appreciate the simple things in life through her interactions with them. Additionally, Francis is a character that could be focused on. His unique accent and his role as the 'brains' of the group in some situations can be developed more in fanfiction.
The victims also offer a lot of potential. There could be a victim who is not as helpless as the others and tries to fight back in clever ways. Their struggle against the killers can make for a great story.
Boxer is an interesting character to focus on. His loyalty and strength were so misused in the original story. In fanfiction, you could give him a chance to see the truth earlier and fight back. Another great character is Benjamin the donkey. His cynical view of the whole situation could be further explored. Maybe he could be the one to finally inspire the other animals to take action. Also, Snowball is interesting. You could write about his exile and what he might be doing to try and regain the farm.
Wilbur Robinson is a great character to focus on. He's adventurous and has that cool time - machine. You can explore his relationship with his family more deeply, like how he tries to fit in with all their eccentricities. Another interesting character is Lewis. His journey from being an orphan to finding a family in the Robinsons is full of potential for further exploration in fanfiction.
Yuuichi is definitely one of the most interesting. His intelligence and ability to manipulate situations make for great storylines. You can explore his motives and how far he's willing to go to win. Another is Tenji, his complex relationship with Yuuichi and his own moral code can be a great focus.
José is also a character with potential. He was Ana's friend from the start and had some unrequited feelings for her. In a fanfiction, you could develop his character more, perhaps showing how he has coped with Ana choosing Christian. Maybe he tries to re - enter Ana's life in a more positive way, which causes some friction in Ana and Christian's relationship.
Danny himself is always a great focus. His dual identity as a normal teen and a ghost - fighting hero gives a lot of room for exploration in family fanfiction. His parents are also very interesting, especially their reactions to Danny's powers and how they could grow and change in a family - centered story.
Iron Man would be really interesting. His different versions could have various levels of technological advancements. One version might have a more extreme version of the Iron Man suit with some out - of - this - world features. Another interesting character would be Hulk. Different Hulks could have different levels of control over their rage. It would be fascinating to see how they interact with each other.