Fics like Code Geass: Lelouch of the the Omnitrix

it started just after Japan lost to Britannia when ten-year old Lelouch and his sister Nunnally find an alien device that did what it did and strapped itself upon Lelouch's wrist with secrets that it hide. Now seven years later with training from their mentor Max Tennyson and their "brother" Rai they fight Britannia and any threat to the world alien or human as a family.

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