Swords of Heaven is a Code Geass multi Crossover story on Fanfiction.com with various media including Gundam, Star Wars and Halo just to name a few, it tells the story of a group of friends who after winning a Gunpla Battle tournament end up in the universe of Code Geass with lots of fictional friends and allies.
Link: https://www.fanfiction.net/s/10483882/1/Swords-of-Heaven
Swords of Heaven contains examples of
- Action Prologue: The first chapter consists of one where Dexter Walker and his allies work to win a space battle.
- Crossover: Not just with Code Geass and Gundam build fighters but also Star Wars, Halo, RWBY, Persona and many others.
- Humongous Mecha: Subverted early in the story as the Mecha are models moved by plasti particles, but played straight in later chapters.