What are the common themes in 'oc x all fanfic'?

" Many heroes emerge in the world of sports, but on the field, I am the king" *This is a translation

[Current world: Danmachi] (PS: I'll change this every time the MC moves worlds since it's a crossover fanfic.) As for the synopsis? Reincarnated and traveling to another world, Eiji Seiya initially thought the world was normal. That was what he thought before he met the heroine and protagonist of the franchise he had watched in his previous life. Not only that, after he awakened the Inner Voice System to grow strong by complaining about plot, heroine and protagonist in his heart to get many rewards. He is determined to increase his power so that he can save his home world, the world where he was reincarnated that was hit by the disaster "Honkai" and save beautiful girls like Kiana, Mai, Bronya, Rita and others who had tragic endings in the original works! "I will save them all!" However... Everything went smoothly... Eiji earned rewards every time he changed the plot in another franchise. It's just that... What's wrong with these heroines? Lala Satalin Deviluke who was supposed to be engaged to the protagonist instead became his fiancée. Sona Sitri suddenly called him to the student council office and said she wanted to make a deal with him. Rias Gremory who was supposed to ask the protagonist for help to solve her political marriage problem with Riser Phenex inexplicably came to him. The girls were disgusted at the protagonists of their respective franchises. Something was wrong here! Not only that, heroines like Kotegawa Yui, Sairenji Haruna, Akeno Himejima, Kuroka, Serafall Leviathan, Grayfia Lucifuge, Sakurajima Mai, Ai Hoshino, Kasumigaoka Utaha, Erica Blandelli and others... They like him! All the super beautiful and sexy women that many men in the world covet surround him and leave their respective protagonists. In the world of Danmachi: Freya is not crazy about Bell, but crazy about him. Hestia is indecisive. Demeter provides support, he no longer has to worry about not having rice or vegetables for his family. Eiji who saw all this was dumbfounded. At first he was confused as to why these heroines were surrounding him, but gradually he realized and knew that it was all happening because ... His inner voice! - The plot that has been changed by the MC: 1. To Love Ru: 100% 2. Danmachi: 5,2% 3. Highschool DxD: 99% 4. Campione: 33% 5. Fate: 58,8% 6. Genshin Impact: 15,4% 7. Seishun Buta Yarou: 90% 8. Oshi no Ko: 100% 9. Saekano: 98% 10. Oregairu: 97% 11. Shinmai Maou no Testament: 100% 12. Mieruko-chan: 100% 13. Trinity Seven: 100% 14. The Legendary Mechanic: 46% 15. Oresuki: 75% 16. Food Wars: 70% 17. Rent-A-Girlfriend: 90% 18. The World God Only Knows: 90% 19. Nisekoi: 80% 20. The Quintessential Quintuplets: 46% 21. Rāmen Daisuki Koizumi-san: 100% 22. Dandadan: 24% 23. My Dress-Up Darling: 81% 24. Amagi Brilliant Park: 96% 25: Danjoru: 32% 26: Junior Highschool DxD: —— 27: Slash Dog: 54% 28: Kaguya-sama Love Is War: 72% This is the plot change process of the latest chapter and will change as the story progresses. By the way, the grammar at the beginning is bad and will improve as the chapter progresses. However, my writing style will not change much because this is an inner voice novel, which means that there will be many reactions from each character. Oh and in chapter hundreds there will be a group chat to prevent the loss of interaction between the heroines. It's a special chat group for the heroines in the MC's harem. - Get the latest chapters faster on my patreon. Support me on patreon to keep me motivated to write more chapters: www.patreon.com/DogLicker

Utaha Kasumigaoka: "Izumi-sensei, you are my woman, don't think about escaping!" Megumi Kato: "There are so many beautiful girls around Izumi-kun, I feel a little unhappy~" Yukino Yukinoshita: "Be honest, do you like me or my sister?" Haruno Yukinoshita: "As the eldest daughter of the Yukinoshita family, as Yukino's sister, I shouldn't have such feelings, but I still have to tell you, Kotomi-san, I like you!" Yui Yuigahama: "Izumi-kun, do you think it's normal for girls to like other girls? Actually, I..." Iroha Isshiki: "Senpai~ Senpai~ I am now your little fangirl, you must take responsibility for me!" Mashiro Shiina: "I suddenly realized that what I like is not only your art. It's also you." Mai Sakurajima: "Really, you're such a cutie that one can't help but want to pamper." It's so full of yuri aura around me!!!

Reborn in 1990s Britain, Noah quickly saw endless business opportunities with his modern knowledge. Success seemed inevitable. But everything changed the day he read a newspaper headline: Howard Stark Dies in Tragic Car Accident. That was when he realized—he wasn’t in the world he thought he was. Things took an even stranger turn when, at eleven years old, an owl delivered a letter that shattered everything he believed— Support link: pat reon.com/RioRaRyu [10+ advance chs] ----------- Copyright disclaimer: I do NOT own anime nor any character or works featured in the fan-fiction. No copyright infringement intended.

Ryen, who traversed into Teyvat, unlocked a two-way portal to the world of Minecraft. Not only can he bring others into MC, but he can also activate various mods? Nahida: "If you want to get rich, start by chopping trees! Dig three blocks and refill the mine once!" Hu Tao: "Hey, piglins over there, why not try this new coffin? Crafted from pure obsidian—buy with confidence, die in peace!" Venti: "Hehe! Dvalin, stop looking for me; I'm worried the Ender Dragon might misunderstand!" Yae Miko: "Yae Publishing House is now mass-producing Drawn Swords! Only 999 Mora each—an essential blade for duels in front of the emperor!" Zhongli: "From a rational perspective, this weapon called Barrett seems more practical than the Vortex Vanquisher." … Years later, the dormant Heavenly Principles awakened. Looking at the drastically transformed Teyvat, they could only slowly raise a question mark. “Heavenly Principles ahead, you are suspected of unlicensed flying within city limits and will be detained and prosecuted by the 73rd Security Bureau of Teyvat.” “You have the right to remain silent. If you resist with force, we will not hesitate to deploy Titan Iron Golems and aerospace carrier battle fleets.” ~~~---------------------- Original Author: 地下道大主管

Chu Feng transmigrates to the vast and mysterious Xuantian Continent, a world where strength determines everything. But unlike others, he can’t cultivate at all. Just when it seems like he’s destined to remain weak and irrelevant, he suddenly awakens a strange system—one that allows him to grow stronger by accepting disciples. Lacking any real knowledge of cultivation techniques, Chu Feng does the only thing he can: he bluffs. He starts recruiting disciples using made-up martial arts and nonsense teachings, hoping to trick the system into making him stronger. What he never expected was that his disciples would take his nonsense seriously—and actually master the techniques he invented. Not just that, they go on to become terrifyingly powerful, shaking the world with their strength. A hundred years later, as his disciples stand at the peak of the cultivation world, one by one becoming legendary Emperors, Chu Feng can only look on in disbelief and mutter: “I made up those techniques… how did you all become Emperors?” ================================================================ Why You Should Read This: The main character doesn’t become overpowered overnight. This isn’t one of those stories where the protagonist takes in one disciple and instantly starts dominating everyone. Chu Feng has to build his strength gradually, and his progress feels earned. It avoids the usual face-slapping, power-trip routine. In the early chapters, you won’t find constant revenge arcs or exaggerated drama. The story takes its time and lets the world—and characters—develop naturally. There’s a subtle layer of humor. The contrast between Chu Feng’s nonsense teachings and the dead-serious disciples who actually succeed with them adds a light, clever touch that keeps the story fun without turning into full comedy. It plays with familiar cultivation tropes while adding a twist. If you’re used to reading xianxia or progression fantasy, you’ll recognize the structure—but this novel bends the formula in some refreshing ways.