Another interesting concept is that the Jewel of Four Souls has some sort of connection to a powerful and rare Pokémon. The characters from both worlds then have to team up to either protect or destroy this connection, depending on whether it's a threat or a potential boon.
First, decide on the main plot. Are you focusing more on the Pokémon aspect, like Pokémon in the Inuyasha world? Or vice versa? Then, think about the characters you want to include. Will it be just the main characters from both or some side characters too? For example, you could start with Ash Ketchum accidentally falling through a portal into the world of Inuyasha.
Well, a cool plot for this crossover fanfiction could be that the Pokemon trainers are summoned to the Inuyasha world to help stop a new evil that is related to both the Pokemon world and the Inuyasha world. Maybe a villain has found a way to combine the power of the Shikon Jewel with a powerful Pokemon artifact. The trainers and their Pokemon have to work together with Inuyasha and his friends. Some Pokemon might evolve during the intense battles, and the Inuyasha characters could learn about the concept of evolution in the Pokemon world, which could be a fun aspect to explore.
I think Pikachu and Shippo would make an adorable pairing. They are both small and cute, but also have their own unique powers. Pikachu's electricity and Shippo's fox magic could be combined in interesting ways during battles. Also, Brock and Miroku would be an interesting pair. Brock is always chasing after girls, and Miroku has his own, well, wandering hand problem. They could bond over their, um, interesting relationship with the opposite sex while also sharing their knowledge of healing (Brock with Pokemon and Miroku with his spiritual healing).
The Naraku would be a likely kidnapper. He is always plotting against Inuyasha and trying to get his hands on the Tessaiga. Kidnapping Inuyasha would be a way for him to either steal the sword or find a way to break Inuyasha's spirit so that he can no longer oppose him.
Sesshomaru would raise the baby with a combination of discipline and protection. He would protect the baby from any threats, using his powerful abilities. At the same time, he would discipline the baby when it made mistakes, teaching it the ways of the demon world. Inuyasha, on the other hand, would add a more carefree and emotional touch to the parenting, creating a balance in the baby's upbringing.
In fanfiction, the baby could be the key to unlocking some long - lost secrets in the Inuyasha universe. Since Sesshomaru and Inuyasha have such complex histories and lineages, the baby might hold the answers to ancient prophecies. It could also have a special bond with the Jewel of Four Souls, perhaps having a unique way of controlling or protecting it that neither of its parents had. And of course, there would be all kinds of emotional drama as the two brothers - turned - co - parents deal with their new relationship.
Well, his tail in fanfiction could be a sign of vulnerability too. Writers might use it as a way to show his softer side. For example, if someone were to grab his tail, it could make him feel really uncomfortable or even weak. It could also be a way for him to show affection in a non - human way, like wagging it when he's happy around Kagome.
One way is through crossovers. For example, a character from Naruto could accidentally end up in the world of Inuyasha. They might use their unique ninja skills, like Naruto's shadow clones, to help fight Inuyasha's enemies. This would add an interesting dynamic as the ninja abilities are different from the demon - slaying techniques in Inuyasha's world.
One possible fanfiction could be about Inuyasha and Sango going on a quest together. They might face a powerful demon that requires both of their skills to defeat. Inuyasha's brute strength combined with Sango's weapon - handling abilities would make for an exciting adventure.