A possible plot could be Venelana going on a solo mission to uncover a mystery that has been plaguing the underworld. This mission could lead her to discover new allies and enemies, and along the way, she could learn more about her own strength and capabilities.
One aspect to consider in a Venelana fanfiction could be her relationship with other characters in the Highschool DxD universe. For example, how she interacts with her family members and how that affects the overall plot. It could also explore her backstory more deeply, perhaps her life before the events of the main story.
One great Venelana Gremory fanfiction could be those that explore her early years in the Highschool DxD universe. Some might focus on her relationship with her family members, like how she influenced Sirzechs and Rias. You can look for them on popular fanfiction websites by simply searching for 'Venelana Gremory Highschool DxD' in the search bar.
Another interesting plot is when Venelana Gremory has to go undercover in an enemy faction. She has to use her wits and charm to blend in and gather information. This plot not only shows her as a strong and capable character but also adds an element of mystery and suspense to the fanfiction.
Maybe Venelana has some connection to a powerful artifact in the Naruto world. Naruto and Venelana then have to embark on a journey to find this artifact before it falls into the wrong hands. Along the way, they learn about each other's cultures and powers.
A common theme is the exploration of relationships. Since it's a harem concept, there will likely be multiple characters vying for Venelana's attention. Another theme could be power dynamics, as in the Highschool DxD universe, power often plays a crucial role in relationships and interactions.
The plot could involve Ben's aliens having an unexpected effect on the magic in the Highschool DxD world. His alien DNA might interact with the devil or angel powers in strange ways. For instance, if he transformed into Heatblast near a magic spell, it could cause the spell to go haywire. And his presence could also disrupt the power balance between the different factions in the DxD world, leading to new alliances and rivalries.
In a fanfiction where Naruto goes to Highschool DxD, he could introduce new concepts of chakra to the world. This would be really fascinating as the characters in DxD might try to incorporate it into their own powers. Naruto could also be a bit of a fish out of water, not fully understanding the social norms and hierarchies in Highschool DxD at first. But his kind heart would help him navigate through it all, and he'd end up changing the school environment in a positive way with his unique personality.
A simple plot could be that they compete in a school - wide tournament. Koneko's pride as a Nekoshou and Issei's determination to prove himself make for an interesting dynamic. They both face tough opponents and along the way, they offer each other advice and support, gradually becoming closer friends.
In this fanfiction, Thanos could be seen as a sort of ultimate antagonist for the entire Highschool DxD world. He might try to use the chaos of the three - way war between the Devils, Angels, and Fallen Angels to his advantage. He could start by eliminating the strongest beings from each side to tip the balance in his favor. However, the characters of Highschool DxD would not go down without a fight and would use their unique abilities and teamwork to try and take on Thanos.
Well, a plot could involve Broly being part of a special program in the Highschool DxD setting. He might be there to learn about controlling his power in a more civilized way. As he tries to fit in, he could befriend some of the main characters from DxD. For example, he could team up with Issei and his friends to compete in some sort of school tournament that has magical and combat elements. This would lead to some epic battles and also some character development for Broly as he learns about friendship and cooperation.