In A Certain Magical Index, Creating the History of Type-Moon

The transmigrator has arrived, and now the heavens are clear! The transmigrator has arrived, and A Certain Magical Index will know peace! After transmigrating into the world of A Certain Magical Index and landing safely, Li En became Aleister's disciple and studied advanced magic. After several years, using the Type-Moon system of magecraft, he finally set foot in the realm of the Magic Gods. A bright and beautiful tomorrow lay before him, but Li En turned it down! What era are we in, still playing at being traditional Magic Gods? No dog would want to be one of those things, trapped in prison outside the world! He would become the Counter Force, both an individual and all things, merging with the world in the form of the Root and ascending to become an ideal Magic God: all things united as one, free from every restriction. He provoked Othinus and smashed the world to pieces. Then he returned to the past and gradually reshaped himself into the world.

The plan worked perfectly, but could someone explain why Moon Cell characters were showing up in A Certain Magical Index? That year, in Rome, Li En stared at the Emperor who kept saying "umu, umu" and froze. Years later, in Britain, Li En gazed speechlessly at the airheaded Saber who was determined to drive out the barbarians. Who knows what year it was when he glared at Zhu Yue, who kept appearing before him one after another, and finally lost his temper. The Angel Fall culprit Metatron Jeanne d'Arc? A Gemstone esper, Nero Claudius? Seriously, where did I end up? Are there no locals in A Certain Magical Index?