I want to try to write a chaos gacha fanfic like bronz_deck but I don't know what world to use:
One piece
Gate
Helluva-verse
Rwby
Moonlit fantasy
Welcome to demon school iruma-kun
Yu Yu Hakusho
Wise mans grandson
Solo leveling
But I wanted to make it like "invincible: gudako! Gacha" by GlassesSama but without the fate element. Like mix bronz_decks chaos gacha with the gamer system or with a different system but not sure which system.
Another idea is to a fanfic like "DxD:the legendary traveler with a system" by zaydas but use different worlds.