It could be that Harry summons Manda in a moment of desperation. He's lost in a strange and enchanted forest, and Manda is known for being an expert in navigating such magical places. So Manda shows up and leads Harry out of the forest, and along the way they form a strong bond.
Maybe Harry summons Manda because he believes Manda has knowledge about a hidden magical artifact. Manda then guides Harry through a series of challenges to find this artifact which could be the key to saving the wizarding world from a new dark threat.
Manda might be a long - lost friend of Harry's family. Maybe she was thought to be dead, but Harry discovers a way to summon her through some ancient magic. She could then play a role in revealing secrets about Harry's family past.
Well, it could be about Naruto having some special powers or a connection to Manda that changes his journey. Maybe he has to deal with the expectations that come with being related to such a powerful being like Manda. He might face challenges from those who fear or envy his newfound status.
The plot could start with Shirou being in a desperate situation in his own world. He discovers an ancient spell or artifact that has the power to summon a powerful ally from another dimension, which turns out to be Naruto. Naruto then helps Shirou fight against the enemies that are threatening his world. Along the way, they face challenges that require both of their skills, like Naruto using his Rasengan against magical beasts and Shirou projecting shields to protect them from enemy attacks.
The plot could be centered around a mysterious quest. Arthuria summons Archer Emiya to help her find a powerful relic that has been lost for centuries. Along the way, they face various foes who also seek the relic. Emiya's ranged combat skills and Arthuria's leadership and swordsmanship complement each other, allowing them to progress through the challenges.
The plot could be centered around a mysterious magical anomaly that Artoria can't handle alone. So she summons Archer Emiya. They then embark on a journey to figure out the source of the anomaly. During this journey, they face many challenges that test their skills and their relationship. Eventually, they succeed in solving the mystery and in the process, become closer as comrades.
The plot could be that Raven is in a dire situation in her world. She discovers an ancient spell that might be able to bring a powerful ally to her side. She decides to use it to summon Naruto. Once Naruto arrives, they face a powerful enemy that is threatening Raven's world. They combine their powers, Naruto's Rasengan and Raven's dark magic, to defeat the enemy.
One possible plot could be that Harry discovers an ancient spell or artifact that allows him to summon angels during a time of great crisis in the wizarding world, like when Voldemort is at his most powerful. The angels could then offer their celestial magic to help Harry and his friends defeat the dark forces.
Well, in such a fanfic, Harry might summon a servant with unique powers. Maybe the servant could help him in his battles against Voldemort. For example, the servant could have the ability to detect dark magic from afar, allowing Harry to be more prepared for attacks.
It could be a house - elf. House - elves are known for their loyalty and their ability to do various tasks. They could be very useful to Harry, like helping him keep his dormitory clean or even spying on the Death Eaters.
A typical plot element could be the conflict that arises from their presence. Some in the wizarding world might be suspicious or even afraid of the idea of the Potters being brought back to life. There could be a struggle between those who support Harry and his parents and those who think it's against the natural order of things. This can create a lot of drama and tension in the fanfic, making it an exciting read.