Looking for some interesting fanfic crossovers. I found that there are a lot of hidden gems. I love and prefer the kind where one person of a series is transported somehow to another's world. My list: Spoiler Along Came a Spider Displaced Friendly Foreign Dimensional Exchange Student Spiderman! My Ideal Academia Twice Inheritor Remnant of a Carnival Heroes, Dreams, and Destiny Playing Our Roles A Void in a Soul A Shattered Vale Mercs in Remnant Rifts Between Worlds Re:Zero, Why Me? The Forge, The Hearth, and The Steel Sword My Trans-Dimensional, Overpowered Protagonist, Harem Comedy is Wrong! Guardian of Remnant Beneath a Broken Moon Unknown Legends Swords and Sorcery: No Route Back Swords and Sorcery: All Ore Nothing The Colours of the World Harry Potter and the Natural 20 Fates Be Changed A Third Path to the Future Dial One Punch League The Dark Shard: Enemy of the Light Life Ore Death Adorable Murderbeasts The Hill of Swords Overlady Halkegenia Online One Punch-Gamer One Punch-Gamer: Chains of Fate OverGamer In Another World with JUST MONIKA Please NO Naruto, One Piece, Bleach, Dragon Ball Z, or Fairy Tail Crossovers. Edit: Also love time travel and time loop stories. Edit2: Just a thought: I'd love to see a I Alone Level Up and RWBY crossover or a EER and RWBY crossover.
It is not a fanfiction(I think) but this crossover is good 'Altina X Overlord Special Collaboration Booklet'
Rigel Black Chronicles is a crossover/hugely AU Harry Potter and Alanna the Lioness fic that I really enjoy! Not sure if this would be what you're looking for but I think the writing's amazing and I really love this series. (Link takes you to the first book.)
I got a Naruto x Mass effect but you don't want Naruto ;( P.S it's AU Naruto world that evolves into mass effect universe
Spider-Quirk: Spiderman en My Hero Academia (En progreso) My Hunter Academia: Killua Zoldyck en My Hero Academia (En progreso) The Battle never ends: Tatsumi en High School DxD (Completo) Is It Wrong To Want To Be The Overlord Of A Dungeon?: El dios Ainz Sama en Danmachi. (Probablemente abandonado)