A new original character could be created to be Batman's wife. This character could be a powerful meta - human with the ability to manipulate energy. She could bring a fresh perspective to Batman's world, and their relationship could explore how Batman deals with having a super - powered partner, and how they balance their personal and crime - fighting lives together.
Catwoman could be a great candidate. In the comics, she has a complex relationship with Batman. In fanfiction, they could get married and she could use her skills as a thief - turned - hero to help Batman in different ways. She already has a deep understanding of the criminal underworld which would be beneficial in their fight against crime.
Wanda could be an interesting candidate. They both have a deep connection within the Avengers. Wanda's powers could be linked to Natasha's in some fanfic scenarios. For example, Wanda could use her powers to shield Natasha and her relationship from the prying eyes of the world, while Natasha uses her skills to protect Wanda from physical threats.
One good candidate could be an original character. For example, a powerful kunoichi from a small, peaceful clan. She could bring a different perspective to Madara's life. Another could be a character from another ninja village, like a Kiri ninja who was sent as a diplomat and ended up falling for Madara.
Anko Mitarashi could be a good candidate. She's strong -willed and has her own set of skills. Her somewhat wild personality could contrast well with Kakashi's more reserved nature. They could have met during a mission and over time, developed feelings for each other.
Catwoman could be an interesting choice. Given their on - again, off - again relationship in the Batman lore, a fanfiction could explore them getting married and how they balance their different moral compasses. Catwoman's thieving skills could be put to good use in helping Batman in some cases, while also causing some friction between them.
Draco Malfoy could be an interesting candidate. Their long - standing rivalry could transform into a deep understanding and love. They have a lot of history together, which could be explored in a romantic context.
One good candidate could be a powerful sage. Sages in the Naruto universe are known for their wisdom and great power. If he was Kaguya's husband, he could have taught her many things about chakra and the world before she turned bad. This would add an interesting backstory to Kaguya's character and also create new plotlines about the origin of chakra in the Naruto world.
An older and more experienced student, like a seventh - year Ravenclaw who has a special talent for defensive magic. They could have spent their years at Hogwarts studying ancient magic texts related to wards and have a fresh perspective on how to improve the school's protection.
Luna Lovegood could be a great candidate. She has a unique perspective on magic and the wizarding world. Her kind and open - minded nature would make her a loving and protective godmother. She could teach Harry about the magical creatures she loves so much and also help him see things from different angles when he's facing difficult situations.
Naruto's son, Boruto, might also be a possibility. He has been growing up in the shadow of his father but has his own unique skills and a different perspective on the ninja world, which could make him a great 8th Hokage.
All Might could be an interesting choice. He has been a major influence on Izuku, and if he were his father, it would add a whole new layer to their relationship. It could explain why All Might took such a special interest in Izuku from the start.