They could start off seeing the baby as just another supernatural problem to deal with. However, as the baby shows signs of innocence and dependence on them, they gradually become more attached. Sam might start reading bedtime stories to the baby, and Dean would teach it basic self - defense skills as it grows older. Their relationship would be a mix of love, protectiveness, and the responsibility of guiding this powerful being.
One possible plotline could be that the baby nephilim has special powers that attract both good and bad supernatural forces. Dean and Sam have to protect the baby while also trying to figure out its true nature. Maybe the baby's powers are the key to closing a major gateway to hell or something like that.
Sam would probably be very protective. He has always been there for Dean, and now with a new addition to the family in the form of a baby, he would see it as his responsibility to keep the baby safe. He might also be a bit of a mentor, teaching the baby about the world of hunting and how to handle different supernatural creatures.
It might develop gradually as Levi helps Eren grow. He would teach Eren things like how to fight, how to be self - sufficient. As Eren learns from Levi, he would start to idolize him. And Levi would see Eren as someone he needs to protect and shape into a good person. Over time, they would become closer, almost like a real father - son duo.
Dean would become more protective. His tough - guy exterior would soften as he takes care of the baby. He'd be more cautious in his hunts, not wanting to leave the baby unprotected.
Itachi might initially be distant, but as he sees the potential in baby Naruto, he could start to leave behind teachings in the form of symbols or small jutsu demonstrations that only Naruto can find or understand. Over time, Naruto would grow to respect this mysterious figure that has been guiding him, and Itachi would come to see Naruto as a hope for the future of the ninja world. This would lead to a relationship based on mutual respect and an unspoken understanding.
In the beginning, Tsunade's relationship with baby Naruto could be based on her sense of duty as a village leader and a healer. However, as she spends more time with him, she discovers his unique charm. Naruto's innocent nature and his unwavering spirit would start to break down Tsunade's tough exterior. She would gradually open up to him, sharing her own experiences and wisdom. Naruto, being a baby, would soak up all this attention and care, and as he grows, he would repay her kindness with loyalty and love. This would lead to a deep - seated relationship that is part family - like, part mentor - mentee, and would be crucial for Naruto's growth as a ninja and a person.
Their relationship might develop with Minato becoming a mentor to baby Kakashi. He could start by teaching him simple things like how to hold a kunai properly.
Mikoto could initially be drawn to baby Naruto because of his unique chakra. As she takes care of him, she shares her wisdom and stories with him. Naruto, being a curious baby, would soak up all this knowledge. Their relationship would develop into a very special one. Mikoto might even introduce Naruto to some of the Uchiha traditions in a way that respects both his Uzumaki heritage and the Uchiha ways. For example, she could teach him some Uchiha - style meditation that helps with chakra control. And Naruto would be so grateful for her presence in his life that he would always strive to be a better ninja under her guidance.
Cristina might become more empathetic. Usually very focused on her work, having a baby could make her see the world from a different perspective. She might start to understand the importance of family more. Owen, on the other hand, could become more patient. Dealing with Cristina's concerns and the new baby would require a lot of patience. He might also become more protective of his family.
Itachi and Baby Naruto's relationship might start in a rather strange way. Itachi, being a complex character, might initially view Baby Naruto as a variable in the grand scheme of the ninja world. But as he watches Naruto grow, he starts to see the purity and determination in him. Itachi, having his own ideas about peace and the future, might start to subtly influence Naruto's environment. For example, he could make sure Naruto gets access to better training materials as he grows up. As Naruto becomes more aware of his surroundings, he might start to feel a strange presence that he can't quite put his finger on. This presence is Itachi, and over time, Naruto might develop a sense of trust towards this unknown protector, which would gradually develop into a deep and meaningful relationship as Naruto matures.