If Naruto is Esdeath's brother in fanfiction, they could embark on adventures across different dimensions. Since Naruto has experience with his own world and Esdeath with hers, they could explore new lands together. They might encounter strange creatures and powerful enemies. Along the way, they could learn from each other's fighting styles and abilities, Naruto teaching Esdeath about chakra and she teaching him about her own brand of combat techniques. And they could also be on a quest to reunite their fragmented family or uncover a long - hidden family secret that has the power to change their worlds.
Esdeath's character can be developed by exploring her backstory in relation to the thief. Maybe she had a similar experience in her past where she was an outcast like the thief. This can make her more empathetic towards the thief. The thief's character can be developed by showing their growth from being a simple thief to someone who has a greater purpose, perhaps influenced by Esdeath's grand plans. As they interact, both characters can change and adapt, making their relationship more complex and interesting.
Well, one possibility could be that Naruto inherits some of Esdeath's cold and calculating nature. Maybe he uses her strategic mind to outwit his enemies in the Naruto universe. He could also have some unique abilities related to ice, like Esdeath does.
One plot idea could be that the thief is initially stealing from Esdeath's domain. Esdeath catches the thief but is intrigued by their skills and instead of punishing them, forces the thief to work for her. As they spend time together, an unlikely bond forms between the cold - hearted Esdeath and the wily thief.
The Akatsuki could still be major antagonists. Their goals of collecting the tailed beasts would put them in direct conflict with Naruto, especially if he has the added power from his relation to Esdeath. They might see him as an even greater threat.
In some fanfictions, the plot could revolve around Naruto introducing new forms of combat training to Esdeath's peerage, inspired by his training with Jiraiya. This could lead to the peerage becoming stronger and more versatile. Also, there could be a plot where the peerage has to protect Naruto from those in their world who see him as a threat, due to his unknown powers and origin.
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Tatsumi is very likely to be involved as he has a significant relationship with Esdeath in the original story. Her subordinates in the Jaegers might also be part of the fanfic. They could be shown as being protective or having mixed feelings about her pregnancy.
In fanfiction, the idea of Naruto being Esdeath's brother might be achieved through some creative world - building. Maybe there could be a crossover of their respective universes where some powerful force or magic links their fates. For example, a powerful sorcerer could have meddled with time and space, causing their families to be connected in some strange way.
A girl I knew got a text from her ex - boyfriend who had passed away a year before. The text just said 'I miss you'. She thought it was some cruel prank at first. But then more texts came. 'Why did you forget me?' She was really scared. She showed the texts to her family, but they thought she was making it up. She changed her number in the end, but she still wonders if it was really her ex - boyfriend somehow reaching out from the other side.