One possible plotline could be that Dante is on a mission in a world that has some connection to Naruto's universe. There, he encounters Kurama. They start off as cautious of each other but then realize they can help each other. For example, Dante could need Kurama's knowledge of the local demonic forces, and Kurama could be interested in Dante's unique weapons.
Well, in 'Dante meets the Transformers fanfiction', Dante is the main character. He is the one who is going to have the encounters with the Transformers. He will bring his own story, his own set of skills and personality into this fictional meeting. The Transformers are important too, but Dante is the one through whose eyes we will probably see most of the action and development in the story.
In the 'Dante meets the Transformers fanfiction', Dante could find himself in a world full of giant robots. He might initially be shocked but then quickly adapt. He could offer his unique perspective on things to the Transformers. For example, he could teach them about human emotions and values which could in turn help the Transformers better understand the planet they are protecting. Also, he might get to ride in one of the Transformers, which would be an amazing experience for him.
In this fanfiction, Dante could have a unique role. Maybe he uses his skills to help the Autobots understand human culture better. He could introduce them to things like music or art, which could be a really interesting aspect of the story. And the Autobots, in turn, might show Dante some of their advanced technology.
Vergil is another character that would make the fanfiction more interesting. He has his own complex relationship with Dante and Sparda. His presence could add a layer of family drama. For example, he might be jealous of the time Dante gets to spend with Sparda, or he could try to prove himself to Sparda in a different way than Dante does.
Perhaps Dante is on a quest to find a mysterious artifact that is said to have a connection to Sparda. Along the way, he encounters various challenges and demons. When he finally reaches the location of the artifact, he is transported to a different realm where he meets Sparda. Sparda then shares some long - forgotten knowledge about their family and the true purpose of the artifact, which could be used to either save or destroy the human world.
A powerful Decepticon could be the main antagonist. Maybe a Decepticon named Shockwave who is on a mission to find Bumblebee and extract some important information from him. He sees Dante as an annoying obstacle in his way and tries to eliminate him. Shockwave's advanced weaponry and cold, calculating nature would pose a great threat to Dante and Bumblebee's friendship and their goals.
One possible plot could be that Dante, perhaps a young and curious adventurer, stumbles upon Bumblebee in a hidden, abandoned junkyard. Dante is initially startled but quickly realizes Bumblebee is no ordinary machine. Bumblebee, being the friendly Autobot he is, tries to communicate with Dante through his radio sounds. Dante, with his quick thinking, starts to understand and they form an unlikely alliance to protect the junkyard from a group of thieves who want to steal valuable parts from the old cars there.
One interesting story could be where Dante and Eva have to team up to fight a powerful new demon threat. They start off not trusting each other much but as the battle progresses, they learn to rely on one another's unique skills.