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.
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.
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 might have some of Naruto's chakra - related powers. Since Naruto has the Nine - Tailed Fox's chakra, the baby could inherit a portion of that incredible power source. Also, Kurenai is skilled in genjutsu, so the baby could have a natural aptitude for that as well.
Well, Naruto's world has a strong ninja culture with values like loyalty and hard work. Ruby Rose is from a more technologically advanced world with a focus on combat against the Grimm. In the upbringing of their baby, they might combine Naruto's physical training regime with Ruby's use of high - tech weapons. For example, the baby could be trained to use a kunai in one hand and a high - tech pistol in the other. They would also have to blend the moral values of both worlds. Naruto's sense of protecting the village and friends could be paired with Ruby's sense of duty to protect humanity from the Grimm.
In this fanfiction, the baby might have a unique power that is a blend of Wolverine and Storm's powers. For example, it could have Wolverine's self - healing ability, but instead of just physical wounds, it could also heal damage to the environment, similar to how Storm can control and restore the weather. Or it could have the ability to use lightning as a weapon, which is related to Storm's powers, but with Wolverine's accuracy and speed.
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 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.
One possible plot could be that Ruby Rose stumbles upon a baby in a dangerous or strange situation. Maybe she's on a mission and finds the baby in an abandoned building. She then decides to take the baby under her wing, protecting it from any threats that come their way.
The baby could have the power of teleportation. Since both Dean and Castiel are involved in a world full of supernatural elements, teleportation would be a useful power. It could help the baby escape dangerous situations or quickly reach its parents when they are in trouble.
The baby could be an orphan from a war - torn area that Ruby Rose discovers. It might have no known family, and Ruby's discovery of the baby could be a turning point for her character, making her more empathetic towards the plight of the innocent in such situations.