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.
I'm not sure which exact 'dante meets kurama fanfiction' is the best, but generally, in these crossovers, Dante from Devil May Cry might have some really interesting interactions with Kurama from Naruto. Some stories could focus on them teaming up against a common enemy, or perhaps Dante being curious about Kurama's power. You'll have to dig through the fanfiction archives to find the ones that suit your taste.
One possible plotline could be that Naruto, due to some external influence or his own preoccupations, fails to communicate with Kurama as he used to. This might lead to Kurama feeling lonely and neglected. For example, if Naruto gets involved in a complex political situation in the village, he might focus all his attention on that and forget about the bond he has with Kurama.
One possible plotline could be Naruto quickly learning to control Kurama's power earlier than in the original story. This might lead to him being able to defeat stronger enemies sooner and gain more respect in the village. Another could be Kurama and Naruto forming a deeper bond right away, and Kurama sharing some of his ancient knowledge with Naruto, which helps Naruto in his ninja training.
One possible plotline could be that Abab is on a quest to gain Kurama's power, and Dons is the place where they meet. Kurama initially resists but then realizes Abab has good intentions.
One possible plotline could be that Harry, through some magical accident, gets transported into Naruto's world. There, he meets Kurama and is immediately in awe of the powerful fox. He then tries to learn from Kurama about power and how to use it in a different way than he's used to in the wizarding world. Another plotline could be that Kurama's spirit somehow enters the Harry Potter universe and Harry is the only one who can sense it. He then has to figure out how to deal with this strange entity while also keeping it a secret from others in Hogwarts.
Another plotline might be that Kurama, having been with Naruto for so long, has some unfinished business related to the ninja world. He enlists Boruto's help to complete it. This could involve uncovering secrets from the past or righting some old wrongs. And along the way, Boruto would grow as a ninja and as a person.
Dante could initially be hostile towards Bumblebee, thinking he is a threat to his world. But Bumblebee's non - aggressive behavior might change Dante's mind. They could then start to exchange knowledge. Bumblebee could teach Dante about advanced alien technology, and Dante could teach Bumblebee about the magic and lore of his world. As they face challenges together, they would learn to trust each other more and more, and their interactions would become more friendly and collaborative.
There could also be a plotline where there is some sort of danger threatening the Pride Lands. Kovu and Mufasa, despite their differences, team up to face this threat. Kovu brings his unique skills and knowledge from his pride, and Mufasa uses his wisdom and leadership. As they work together, they develop a mutual respect for each other that was not there before.
Maybe Talion could help Frodo on his journey to destroy the One Ring. He has his own combat skills, so he could offer protection against the various threats that Frodo faces.
One possible plotline could be a competition between Naruto and Sebastian. For example, a contest of skills where Naruto shows off his ninja moves and Sebastian displays his butler feats.