One potential character could be Harry Potter in a crossover with a magical world. The sirens' powers might be something new and dangerous that he has to face at Hogwarts. He could use his magic skills to try and counter the sirens' alluring voices. Another character could be Katniss Everdeen from The Hunger Games in a post - apocalyptic crossover. The sirens could be part of the Capitol's new weapon, and Katniss would have to find a way to fight against them. And in a crossover with a pirate - themed story, Captain Jack Sparrow could be included. Jack's wily nature might make him both a target and an ally of the sirens.
One idea could be to cross it with a popular fantasy world like Middle - earth. The sirens could be a new and mysterious race that the characters encounter. They might have their own agenda, perhaps related to the power of the One Ring. Another plot idea could be a crossover with a superhero universe. The sirens' powers could be a new threat or an unexpected ally to the superheroes. For example, their alluring voices could be used to either hypnotize villains or accidentally cause chaos among the heroes.
As it's OC (original character) fanfiction, the main characters would likely be the original characters created by the fanfic writer. However, they might also include some of the canon characters from 'Siren's Lament' to interact with the OCs.
Well, in a Naruto - One Piece crossover, characters like Luffy and Naruto would be a must. Zoro could learn some sword - based jutsu from Naruto. And Nami might be interested in the ninja tools Naruto uses for stealth and thievery prevention on the ship.
Well, if it's a crossover with Ultraman, Ultraman could be a great addition. His super strength and light - based powers would contrast well with the Jetman's abilities. They could have a friendly rivalry at first but then team up to face a powerful kaiju that is threatening both their worlds.
You could include a wise old mentor figure, like an old gardener who gives Cinderfella advice. A friendly mouse that helps Cinderfella around the house. And of course, the beautiful princess who Cinderfella falls in love with at the ball.
In a crossover with 'The Last of Us', Joel and Ellie would be great additions. Joel's survival skills and Ellie's immunity could bring new dynamics to the State of Decay world. Also, from 'Left 4 Dead', the four survivors like Bill, Francis, Zoey, and Louis could be included. Their combat skills against zombies could be interesting when combined with the State of Decay gameplay.
Alfred Pennyworth could be included. He could offer his wisdom and support to both heroes. Maybe he even has some insights about the similarities and differences between Gotham and Starling City. Another character could be Felicity Smoak. She could help with the tech - related aspects of the case they are working on together.
Characters from 'Teen Titans' could be great. Their superpowers and the Saturdays' knowledge of the supernatural could lead to some amazing adventures. Imagine Raven's magic and Beast Boy's shape - shifting working together with the Saturdays. Also, characters from 'Gargoyles' could be interesting. The Gargoyles' nocturnal nature and combat skills along with the Saturdays' would create a really unique dynamic in the fanfiction.
It could be about various things. Maybe it focuses on original characters (OCs) within the context of the 'Siren's Lament' world. It might explore their backstories, relationships, or new adventures in that universe.
Definitely Zeref. Since he has a connection to the Etherious and also to Natsu in the original Fairy Tail story. Another good character could be Gray Fullbuster. His ice - magic could contrast well with the more chaotic and dark powers of the Etherious. Also, Mavis Vermillion could be included. Her wisdom and powerful magic could play a role in helping Natsu deal with the Etherious side of things.