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Okay... This feels like a dumb idea in mind but I'll type it anyway since I'm kind of curious. What if Touma meets a powerful god far before he met the ones in canon in the form of a child? What if he decides to take her in after hearing her viewpoint about life or anything in general is meaningless as everything will return to nothing? Unbeknownst to him, he would be taking care of a level 6 entity from another reality.

This is a crossoverfic idea involving HSR's Aeon of Nihility.

That's just a thought but I am curious if there are more Toaru majutsu no index crossovers aside from fate, MHA and naruto because I want to read about him to encounter characters that people come to understand or not. I mean I saw a Honkai Impact one with him meeting a certain fool and I loved it. So, do you guys have any fic ideas or crossover stories you know?