Fics like The Devil Mage of Two Worlds

To Louise the Springtime Familiar Summoning was her only chance to show that she was truly a mage and not a failure. But fate had other plans for instead of summoning a familiar, she was thrown into a world both different and advanced in its own way called Earth. A decade later, as a decorated Marine, Louise found her worlds colliding when a mysterious a gate opens in the Streets of Ginza. Unleashing an invading force clad in medieval and Renaissance armor with fantasy beings and magic, one that she recognized all too well.

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2. Familiar Evil by Jessesanman, NaanContributor, xTRESTWHOx (ゼロの使い魔 | Zero no Tsukaima | The Familiar of Zero, Biohazard | Resident Evil (Gameverse))
3. Bullets and Soul (Modern US in Hollow Knight) by QzCombine (Hollow Knight (Video Games), ゲート 自衛隊彼の地にて斯く戦えり | GATE: Jietai Kanochi nite Kaku Tatakaeri (Anime), more)
4. Fallout of Zero: A Post-Nuclear Reverse Summon Story by NaanContributor, xTRESTWHOx (Fallout (Video Games), ゼロの使い魔 | Zero no Tsukaima | The Familiar of Zero)
5. Louise Summons a Cute, Fluffy, Alien Experiment by RainEStar3 (ゼロの使い魔 | Zero no Tsukaima | The Familiar of Zero, Lilo & Stitch (2002))
6. The Ambassador by Ernalore (Re:ゼロから始める異世界生活 | Re:Zero Starting Life in Another World (Anime), ゲート 自衛隊彼の地にて斯く戦えり | GATE: Jietai Kanochi nite Kaku Tatakaeri (Anime), more)
7. Gate: Thus Gods Met Dragons by HandMonkey (Monster Hunter (Video Games), ゲート 自衛隊彼の地にて斯く戦えり | GATE: Jietai Kanochi nite Kaku Tatakaeri (Anime), more)
8. To Teach a Zero by L3t_U5_D0_That_Aga1n (Elder Scrolls V: Skyrim, ゼロの使い魔 | Zero no Tsukaima | The Familiar of Zero)
9. Inventory of Chaos: Iconic Scenes That Shattered Everyone Instantly by Icedrone24 (ワンパンマン | One-Punch Man, ゼロの使い魔 | Zero no Tsukaima | The Familiar of Zero, more)
10. A Strange Zero by DanIsAlwaysHere (ゼロの使い魔 | Zero no Tsukaima | The Familiar of Zero, Marvel Cinematic Universe, more)
11. Is It Wrong To Adopt Lost Souls From Other Dimensions Into The Familia? by Makuro767 (Naruto (Anime & Manga), D.Gray-man (Anime & Manga), more)
12. GATE: thus the tankery schools fought there! by RedSS (Girls und Panzer, ゲート 自衛隊彼の地にて斯く戦えり | GATE: Jietai Kanochi nite Kaku Tatakaeri (Anime), more)
13. Beautiful, Wise, Powerful by FergardStratoavis (ゼロの使い魔 | Zero no Tsukaima | The Familiar of Zero, 北斗の拳 | Hokuto no Ken | Fist of the North Star, more)
14. Overlady by EarthScorpion (Overlord - Fandom, ゼロの使い魔 | Zero no Tsukaima | The Familiar of Zero)
15. Monster Hunter: A New World by CodeCipher (Monster Hunter (Video Games), ゲート 自衛隊彼の地にて斯く戦えり | GATE: Jietai Kanochi nite Kaku Tatakaeri (Anime), more)
16. A Military Hero in Another World by Nickbuckhart32 (ゲート 自衛隊彼の地にて斯く戦えり | GATE: Jietai Kanochi nite Kaku Tatakaeri (Anime), 僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia (Anime & Manga))
17. Louise Summons a Pokemon Trainer by RainEStar3 (ゼロの使い魔 | Zero no Tsukaima | The Familiar of Zero, Pocket Monsters | Pokemon (Anime))
18. All of These Familiar Faces by Clocksmith (ゼロの使い魔 | Zero no Tsukaima | The Familiar of Zero, Doctor Who (2005), more)
19. Fall into Darkness by Touhoufanatic (ゼロの使い魔 | Zero no Tsukaima | The Familiar of Zero, Monster Girl Encyclopedia)
20. Louise's Lavish Submission by Gamerman246 (ゼロの使い魔 | Zero no Tsukaima | The Familiar of Zero)