Fics like Code Sage

When she was young, Lelucia vi Britannia occasionally heard a voice. Saying things like "Notice", "Warning" and "Answer". At the time, she didn't understand it. After she was exiled to Japan, then having her life ruined again by the invasion, her hatred for Britannia coalesced, triggering a reaction from the voice. Seven years later, a routine chess match becomes a prelude for a nightmare. Getting almost run over, accidentally falling inside a truck, getting mistaken for a terrorist, watching her best friend die, and being pressured by impending death to the limit, she snaps. And in response, the reaction from the past finally completes. Now, armed with a Geass in one eye and the Sage in another, Lelucia embarks on a journey of revenge against the country that wronged her, weaving a complex web of secrets to protect what is dear to her, with only that voice as her unconditional support. (I should probably mention that this is on hiatus for the foreseeable future)

You may also like

1. Son of the Storm Dragon by AshtonK (転生したらスライムだった件 - 伏瀬 | Tensei Shitara Slime Datta Ken | That Time I Got Reincarnated as a Slime - Fuse)
2. Dominant Run! by Greyninja27 (転生したらスライムだった件 - 伏瀬 | Tensei Shitara Slime Datta Ken | That Time I Got Reincarnated as a Slime - Fuse)
3. Is It Wrong to Summon Waifus in the Dungeon by PoetIbn (ダンジョンに出会いを求めるのは間違っているだろうか | DanMachi | Is It Wrong to Try to Pick Up Girls in a Dungeon? (Anime), イジらないで長瀞さん | Ijiranaide Nagatoro-san | Please Don't Bully Me Nagatoro (Anime), more)
4. Finally Living As Your True Self by RubyMoonlight (転生したらスライムだった件 - 伏瀬 | Tensei Shitara Slime Datta Ken | That Time I Got Reincarnated as a Slime - Fuse)
5. Quirks, Gourmet, Demigods, Dragons, Slimes and Aliens, Oh My by AliasEinzwerthos, AzemTheEverRecording, Darth_striker117, Orion_the_Omniversal_Watcher (僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia (Anime & Manga), Percy Jackson and the Olympians - Rick Riordan, more)
6. The Overlord Geass by PauThide (Overlord - Maruyama Kugane & Related Fandoms, Code Geass)
7. Gwrthryfel y Ci Du by MosesArk_Reborn2000 (Code Geass)
8. Multiverse Family Group Chat by DragonKeyBearer (Persona Series, Persona 3, more)
9. Self-insert One Shot Collection by Not_So_Dark_One (A Song of Ice and Fire & Related Fandoms, House of the Dragon (TV), more)
10. His Britannia by Imperator0slave (Code Geass)
11. Shizu, Lord of Wisdom by Willsteredge (転生したらスライムだった件 - 伏瀬 | Tensei Shitara Slime Datta Ken | That Time I Got Reincarnated as a Slime - Fuse)
12. The Misadventures of Ark by Swaginton (My Little Pony Generation 4: Friendship is Magic (Cartoon 2010), SCP Foundation, more)
13. Code Azur: Lelouch of the Fleet by META2012 (碧蓝航线 | Azur Lane (Video Game), Code Geass, more)
14. Black Iris by Kaitou_Luminous (転生したらスライムだった件 - 伏瀬 | Tensei Shitara Slime Datta Ken | That Time I Got Reincarnated as a Slime - Fuse)
15. Slime adventures and helping the true dragon's problem. by Hypertrixdark (転生したらスライムだった件 - 伏瀬 | Tensei Shitara Slime Datta Ken | That Time I Got Reincarnated as a Slime - Fuse, star war, more)
16. The Tavern at the Edge of Tempest by WhisperingKage, YukimuraShuusukeGirl (InuYasha - A Feudal Fairy Tale, 転生したらスライムだった件 - 伏瀬 | Tensei Shitara Slime Datta Ken | That Time I Got Reincarnated as a Slime - Fuse)
17. I'm A Spider - Wait, What? by melovecats (転生したらスライムだった件 - 伏瀬 | Tensei Shitara Slime Datta Ken | That Time I Got Reincarnated as a Slime - Fuse, 蜘蛛ですが なにか? | Kumo desu ga Nani ka | So I'm a Spider So What? - Okina Baba)
18. Master of Death, Lord of Monsters by TheSilverboar (Harry Potter - J. K. Rowling, 転生したらスライムだった件 - 伏瀬 | Tensei Shitara Slime Datta Ken | That Time I Got Reincarnated as a Slime - Fuse)
19. The Consequences of Chaos by NiceApep (転生したらスライムだった件 - 伏瀬 | Tensei Shitara Slime Datta Ken | That Time I Got Reincarnated as a Slime - Fuse)
20. Limitless in a World of Monsters by 99fireflies (転生したらスライムだった件 - 伏瀬 | Tensei Shitara Slime Datta Ken | That Time I Got Reincarnated as a Slime - Fuse, 呪術廻戦 | Jujutsu Kaisen (Anime & Manga))