The baby might inherit a combination of their abilities. For example, Knuckles' strength could be enhanced by Rouge's agility. So the baby could be not only strong but also very nimble. Also, Rouge has some skills in detecting precious items. The baby could inherit a form of that ability, perhaps being able to sense things that are important or valuable. And from Knuckles, the baby could get his resistance to certain types of attacks, making it a very formidable little character in the fanfiction.
There's a possibility that the baby could inherit Knuckles' connection to the Master Emerald. Maybe the baby would have some sort of enhanced intuition when it comes to protecting powerful artifacts. From Rouge, the baby could inherit her stealth skills. Rouge is very good at sneaking around, and this could be a useful ability for the baby to have, especially if they get into adventures in the fanfiction world.
The baby could inherit Naruto's chakra reserves and his ability to use the Rasengan. Since Naruto has an enormous amount of chakra, it would make sense for the baby to also have a large chakra pool. The Rasengan is one of Naruto's signature moves, and it could be passed down genetically or through training that Naruto would give the baby as it grows up.
The baby could have Naruto's ability to use the Rasengan. Since Naruto has mastered this powerful technique, it might be passed down genetically or through training. Also, it could inherit Samui's intelligence and strategic thinking. This combination would make the baby a very formidable ninja.
The baby could inherit a lot. From Ichigo, it might get his ability to constantly adapt and grow stronger in battle. Considering Soifon's expertise in assassination and combat, the baby could inherit her precision and accuracy. Also, if we think about spiritual powers, the baby could have a blend of Ichigo's and Soifon's spiritual pressure. It might also develop new powers that are unique to it, based on the combination of their genetic makeup and spiritual essence.
One possible plot could be that Shadow and Rouge initially struggle with the idea of having a baby. They might be worried about how their dangerous lifestyles as agents would affect the child. But as the story progresses, they start to embrace the idea and prepare for the baby's arrival. They could face challenges like protecting their unborn child from their enemies who might see it as a weakness or a target.
Knuckles is very duty - bound. So in parenting, he'd focus on teaching the baby responsibility, like taking care of the Master Emerald or protecting their home. Rouge is more of a free - spirit in a way. She might encourage the baby to explore the world and not be afraid to take risks. But this could also lead to some clashes between them as Knuckles might be more cautious. However, over time, they could learn to balance each other out for the sake of their baby.
Another possibility is that the baby has a combined power. It could use water to create illusions, a mix of Percy's water control and Annabeth's strategic thinking. So when in a fight, it could create false images of itself using water to confuse the enemy and then attack from an unexpected angle.
The baby could potentially have Naruto's chakra powers. Since Naruto has a vast amount of chakra and can access the Nine - Tails' power, the baby might inherit some of that. Maybe it could also have some unique abilities from the OC. For example, if the OC has a special type of jutsu related to nature manipulation, the baby could have a combined form of that and Naruto's powers.
The baby could inherit Naruto's chakra - based powers. It might be able to use techniques like the Rasengan or Shadow Clone Jutsu. From Ruby Rose, it could inherit the ability to use Dust and perhaps have a semblance related to speed or agility, similar to Ruby's own. Maybe it could even combine these powers, like using chakra to enhance the effectiveness of Dust - based attacks.
Well, it could inherit some of Harry's skills like Parseltongue perhaps, given its connection to Slytherin's heritage through Harry. And from Fleur, it might have an affinity for water magic since she has Veela heritage. Maybe the baby could also have strong defensive magic abilities as both Harry and Fleur have shown great courage and the ability to defend themselves in tough situations.
It could be about how they first realized their feelings for each other. Maybe during an adventure, they find themselves relying on each other more and more, which eventually leads to their marriage.