Fics like World's Finest Mage

In the aftermath of the collapse of the 203rd Aerial Mage Division, Tanya von Degurechaff is struck down by Mary Sue who successfully fires a beam, striking down the Devil of the Rhine for good. Tanya was satisfied to call it an end, claiming endsieg over Being X before appearing before a goddess who offered Tanya a chance of reincarnation in the Noble Assassin House of Tuatha Dé

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1. I Thought This Was Isekai Quartet, So Why Are We Watching Re:Zero?! by Hotaru12 (Re:ゼロから始める異世界生活 | Re:Zero Starting Life in Another World (Anime), この素晴らしい世界に祝福を! | KonoSuba: God's Blessing on this Wonderful World! - All Media Types, more)
2. A Young Girl's Delinquency Record by GremlinJack (幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Anime), 幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Manga))
3. On a Pale Horse by WrandmWaffles (幼女戦記 | Youjo Senki | Saga of Tanya the Evil - Carlo Zen (Light Novels), ウマ娘 プリティーダービー | Uma Musume: Pretty Derby (Anime), more)
4. Breaking Tanya by A_Morte_Perpetua_Machina_Libera_Nos (幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Anime), 幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Manga), more)
5. Chaotic Cultivation (Original Xianxia/Chaos Gacha) by Iceduke (Original Work, 幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Anime), more)
6. That Time I Got Isekai'd Again and Befriended a Slime by TanJaded (転生したらスライムだった件 - 伏瀬 | Tensei Shitara Slime Datta Ken | Regarding Reincarnated to Slime - Fuse, 幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Anime), more)
7. A Young Girl's Game of Thrones by Failninjaninja (Game of Thrones (TV), A Song of Ice and Fire - George R. R. Martin, more)
8. A Young Vampire's Cohabitation Arrangements by WrandmWaffles (The Dresden Files - Jim Butcher, 幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Anime))
9. Mage×Family by SwissChocolatess (幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Anime), 幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Manga), more)
10. A Young Woman's Inevitable Dance of the Dragons by Failninjaninja (Game of Thrones (TV), A Song of Ice and Fire - George R. R. Martin, more)
11. ATIG Omake: Visha's War(games) by UNSC_Kawakaze (Halo (Video Games) & Related Fandoms, 幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Anime), more)
12. Saga of Katherine Pryde by Deras_Calhoun (X-Men - All Media Types, X-Men (Movieverse), more)
13. Sister of Disaster [Youjo Senki x Overlord] by SwissChocolatess (幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Anime), 幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Manga), more)
14. All That Is Gold Does Not Glitter by XenoWrites (Halo (Video Games) & Related Fandoms, 幼女戦記 | Youjo Senki | Saga of Tanya the Evil - Carlo Zen (Light Novels), more)
15. God's Blessing on this Crimson Devil! by SwissChocolatess (この素晴らしい世界に祝福を! | KonoSuba: God's Blessing on this Wonderful World! - All Media Types, 幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Anime), more)
16. Angel in the Asylum (Youjo Senki x Outlast) by KsiadzRobak21 (幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Anime), 幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Manga), more)
17. A young Girl's Adventure's Across Toril by Sympathetic30 (幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Anime), 幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Manga), more)
18. Inheriting the Mantle by SugarcaneSoldier (幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Anime), Harry Potter - J. K. Rowling)
19. A Young Octoling's Inkantation [Youjo Senki x Splatoon] by SwissChocolatess (幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Anime), 幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Manga), more)
20. Mushoku Tensei: Tanya's Reincarnation by Betaorionis24 (無職転生 ～異世界行ったら本気だす～ - 理不尽な孫の手 | Mushoku Tensei: Isekai Ittara Honki Dasu - Rifujin na Magonote, 幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Manga), more)