Hero-of-Remnant
Earth: A world with conflict of war, imagination, and great technological advancement.
Remnant: A world filled with monsters, magical crystals, and great technological advancement.
The two worlds are different from each other, but their conflicts are almost the same towards each other. But when Remnant Doomsday is approaching, new warriors from Earth come into the story to help and protect. But most importantly, to change its future.
[This is based on RWBY which was owned by Rooster Teeth and was created by Monty Oum, along with real-life events of the world. The only thing I take credit for is the characters I made myself.]