Perhaps an ancient youkai spirit that resides within the academy grounds could be an ally. This spirit might see Ichigo's arrival as a sign of change and decides to assist him. It could provide Ichigo with information about the academy's hidden areas or secrets that can help him in his journey at the Youkai Academy.
One potential ally could be a friendly youkai student who is intrigued by Ichigo's godlike powers. Maybe someone who is an outcast among the youkai and sees Ichigo as a kindred spirit.
There could be some of the more benevolent yokai who see Ichigo as a potential ally. For example, the werewolf Koga might recognize Ichigo's strength and see an opportunity to team up with him against common enemies. Maybe even some of the teachers at the academy who are tired of the chaos and power plays could join forces with Ichigo.
Well, it could be about Ichigo, with his godlike powers, entering Youkai Academy and facing various challenges there. Maybe he has to hide his true nature from the other students, who are mostly youkai. He might also get involved in some power struggles within the academy.
Perhaps some of the less powerful youkai who are often bullied could become his allies. They would see Naruto as a protector and someone who can stand up to the stronger, meaner youkai.
One possible ally could be a powerful mage from a different anime in the crossover. This mage could help Ichigo understand the strange magic or energy in the new world he is stuck in. Also, Uryu might be an ally. His Quincy abilities could complement Ichigo's powers in Mugetsu form as they face new threats together.
Well, Ichigo might have all kinds of crazy adventures at Yokai Academy. He could use his godlike powers to deal with the various yokai there, maybe make some unlikely friends among the yokai students, or face off against powerful yokai villains.
Renji could be a key character. He could be a senior student who at first is a bit tough on Ichigo but later becomes a mentor. Orihime could also be there, and she might be in the same class as Ichigo, providing some emotional support and her own unique skills in the academy setting.
One potential antagonist could be an ancient evil that is awakened by Ichigo's newfound power. This entity might see Ichigo as a threat or as a means to achieve its own dark goals.
Maybe Naruto from Naruto could be a crossover character. His ninja skills and Ichigo's combat abilities could create some unique fight scenes. Also, their different ideologies about friendship and power could lead to some great character interactions.
Well, in this fanfiction, Naruto's godlike status would likely change the power dynamics at Youkai Academy. He might end up making friends with some of the outcast youkai because of his strong sense of justice. And he could be a target for those who want to steal his powers or prove themselves stronger. Maybe he has to participate in some sort of tournament or trial at the academy to show his worth and also to protect the place from an external threat.
Definitely Hermione. She is smart and would be able to help Ichigo understand the complex magic world. Also, Hagrid. He is kind - hearted and has a lot of knowledge about magical creatures, which could be useful for Ichigo.