One idea could be that deaged Tony and T'Challa have to work together to solve a mystery in their shrunken state. Maybe they use their unique skills but in a more child - like and innocent way.
Another plot could be that they are deaged during a big battle. Their allies don't recognize them at first. They have to prove themselves and also find a way to reverse the de - aging process. Along the way, they form an even closer bond as they face challenges together and learn from each other's different perspectives.
A great plot could involve deaged Tony getting involved in the early days of Stark Industries. He might see things from a new perspective and try to change the company's direction towards more ethical practices right from the start. This could lead to all kinds of adventures as he tries to convince the adults around him to listen to him. He could also form unexpected friendships with employees who later become important in the 'grown - up' Tony's life.
Maybe an old enemy from Wakanda's past. This enemy sees the deaged Tony and T'Challa as easy targets. He wants to steal Wakanda's technology and Iron Man's tech. He tries to manipulate the deaged heroes and use them for his own evil plans.
One interesting plot could be them teaming up to solve a global energy crisis. Tony's technological expertise and T'Challa's knowledge of Wakandan resources combine to create a new, sustainable energy source. Another plot might involve them facing a common enemy who is stealing advanced technology from both Stark Industries and Wakanda. They have to use their wits and unique abilities to stop the thief.
Perhaps a plot where T'Challa has to go undercover in different parts of the world and ends up relying on the help of many different individuals. This would create a lot of interesting character dynamics as he builds relationships with people he might not have otherwise interacted with.
One idea could be exploring T'Challa's relationship with an original character (OC) during his time as king. The OC could be a diplomat from another nation, and their interactions could involve political intrigue and cultural exchanges.
One great t'challa and tony fanfiction story could be about them teaming up to solve a global crisis. They combine their unique skills, with T'Challa's leadership and combat abilities and Tony's technological genius.
Maybe in the fanfiction, they had a disagreement over some high - tech stuff. Tony is known for his tech and if T'Challa had different ideas about using or sharing technology, it could make Tony mad.
One great aspect of fanfiction involving Tony and T'Challa could be their different technological approaches coming together. Tony is all about high - tech, flashy Iron Man suits and advanced weaponry. T'Challa, on the other hand, has the advanced Wakandan technology which is more rooted in tradition and secrecy. In a fanfiction, they could collaborate on a project to upgrade the Avengers' technology while also respecting Wakandan traditions. For example, they might combine Tony's miniaturization techniques with Wakandan vibranium - based energy sources to create a new kind of power cell for the Avengers' equipment.
Well, a plot might be that Hermione is deaged due to a magical accident in the library. As a deaged Hermione, she has a different view on things. She might start to question the rules of Hogwarts more, as she doesn't have the same level of respect for them as her older self. Her friends, Harry and Ron, would have to deal with this new, more rebellious Hermione while also trying to figure out how to reverse the deaging spell. This could cause a lot of chaos in Hogwarts.
One idea could be that the deaged Joker, now with a child's body but his same devious mind, tries to manipulate the younger version of Batman into believing they are friends while secretly setting up traps. Another could be that the deaged Joker's actions cause Batman to re - evaluate his own origin story and how it might be related to this new, younger - but - still - dangerous foe. Or perhaps the deaged Joker forms an alliance with other deaged villains in Gotham, creating chaos that Batman has to stop.