They could go on an adventure to find a lost Wakandan artifact that has some sort of connection to Peter's powers. Maybe it was stolen by a group of thieves who don't understand its true value. Peter and Shuri would have to travel across different countries, using their unique skills. Peter's agility and spider - sense, and Shuri's intelligence and access to Wakandan technology.
Another fanfiction could start with Peter getting into some sort of trouble in New York, and Shuri somehow gets involved in helping him. Maybe a new villain has a device that can disrupt Spider - Man's powers, and Shuri uses her Wakandan knowledge to analyze it and find a solution. Along the way, they become really good friends, joking around and learning about each other's cultures.
One adventure could be that they go on a journey to find a rare magical ingredient for a potion. It's located in a dangerous forest. Hermione's knowledge of magical plants and Blaise's skills in self - defense (learnt from his Slytherin upbringing) help them navigate through the forest. Along the way, they encounter strange magical beasts and have to use their combined wits to overcome the obstacles. They also have to deal with other wizards who are also after the ingredient, leading to some tense confrontations.
They might have adventures exploring different planets. Peter's charm and Rocket's combat skills would make them a great team. For example, they could be on a mission to find a rare artifact on an uncharted planet. Along the way, they'd face various challenges like hostile aliens and dangerous terrains.
They could go on a quest to find a lost magical artifact. Maybe it's a powerful weapon that was hidden long ago to prevent misuse. Percy's skills in water combat and Leo's mechanical genius would be very useful. For example, if they come across a flooded cave where the artifact is hidden, Percy can navigate through the water while Leo figures out how to bypass any mechanical traps.
They could have an adventure in an enchanted forest. Maybe they get lost and have to use Percy's skills with water to find a way out, like creating a stream that leads them to safety while Piper uses her charm - speaking to communicate with the forest animals for directions.
They could have an adventure exploring the Forbidden Forest. Dudley, being curious about Harry's world, could tag along with Harry. They might encounter magical creatures like centaurs or unicorns. Dudley would be in awe and a bit scared at first, but with Harry's guidance, they could learn about these creatures and even help one in need, like a unicorn caught in a trap. This adventure would strengthen their friendship as they rely on each other in the forest.
They could go on an adventure to explore the hidden secrets of the ninja world. Maybe there are ancient ruins that hold the key to a powerful jutsu, and Naruto and Kyuubi work together to uncover it. Naruto uses his ninja skills and Kyuubi provides the necessary power boost when needed.
They could go on a quest to find a magical - technological hybrid artifact. The two of them would use their unique skills. Tony would use his tech to analyze the magical elements and Harry would use his magic to navigate through the enchanted areas they might encounter.
Well, one possible plot could be that Peter is sent to Wakanda on a mission by Stark (before his death perhaps). There he meets Shuri. Shuri is initially skeptical of this young outsider but as Peter shows his intelligence and skills (like his web - shooting tech), she warms up to him. They then work together to improve some of Wakanda's security systems using Peter's unique perspective on technology.
Well, they might start by being a bit cautious around each other. Maybe Shuri is intrigued by Peter's spider - like abilities and Peter is in awe of Shuri's technological genius. They could exchange ideas on how to use technology in combat or how to better protect their respective cities.