Can you recommend some good 'lost and found' themed fanfiction that is suitable for all ages?

Chen Yan travels between worlds, ending up becoming an honorable prince in a medieval fantasy world. Yet this world was not quite as simple as he thought. Witches with magical powers abound, and fearsome wars between churches and kingdoms rage throughout the land. Roland, a prince regarded as hopeless by his own father and assigned to the worst fief, spends his time developing a poor and backward town into a strong and modern city, while fighting against his siblings for the throne and absolute control over the kingdom. Join Roland as he befriends and allies with witches and, through fighting and even farming, pushes back invaders coming from the realm of evil.

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

Just transmigrated to a new world… and it was destroyed. Takumi became the last human in this world. Fortunately, a chat group descended. On his first check-in, he received the "Cocoon of the End" and became permanently bound to this world. The stronger the civilization, the stronger his power. But... there are no more humans in this world. So, dear bros in the group, wanna immigrate? Free houses, free land, and even free superpowers! You don’t want those cursed children? I’ll take them! Raw : 综漫群聊，世界毁灭了才让我来？

[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

During an internal Navy hearing, the top brass conducted a serious inquiry into Rogers Daren, the so-called "scum of the Marines" and Admiral of the North Blue. "You’ve had improper relations with royal princesses and noble ladies from multiple North Blue kingdoms?" "I call it showing care for the people." Marines High Command: … "How do you explain the absurdly high salaries of the North Blue Marines under your command?" "Well, with what the HQ pays, how else do you expect them to risk their lives?" Marines High Command: (ーー`) "Why is the North Blue fleet equipped with technology from Germa?" "That’s just military-civilian cooperation. Germa 66 was moved by my sense of justice." Marines High Command: (○_○) "And how do you explain the unusual deaths of a Celestial Dragon in the North Blue?" Daren sighed. "A maritime accident… truly unfortunate. I personally express my deepest condolences." Marines High Command: (._.?) And so begins the story of a rebellious, unorthodox Marine.

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!!!