Naruto: From the Start, I Summon a Divine Dragon

[Hokage + outrageous schemes + a complicated mix + master schemer + making up for regrets] Just after Uchiha Xiu transmigrated to the Hokage world, he was chosen by a being who might have been a god and tasked with stopping the apocalypse. He became a Chosen Child, a duelist, an evil Uchiha, a martial artist, a fire demon, an Eva pilot... But despite his bizarre style and wildly mixed bag of abilities, Uchiha Xiu never made anyone in the ninja world suspicious! Every one of his incredible abilities could somehow be explained using the Hokage world's theories. Orochimaru, one of the Konoha Sannin, even declared, “Uchiha Xiu is just a clown who craves attention, not a real scientist. His supposedly amazing abilities are childish, laughable, and nothing special.” That was exactly what Uchiha Xiu wanted to hear. From then on, he became the ultimate schemer, surpassing even Black Zetsu, and made the entire ninja world carry countless sacks of rice for him. How high was that pile of rice? About three or four stories tall. The Dragon Ball Shenron is a summoning beast, the Three Egyptian Gods from Yu-Gi-Oh! are Susanoo, the Twelve Zodiac Charms are ninjutsu, the Shadow Troopers are shadow clones, JoJo Stands are Limbo: Border Jail, Ultraman Tiga is the Demonic Statue of the Outer Path, and Eva Unit-01 is the Ten-Tails...