This is Maria.
Maria isn't like our world, It's full of beasts and warriors. Magic as well. There are wizards and witches, trainers and riders, assassins and bounty hunters, Warriors and royalty.
This is Eren.
Eren is a rider. A rider is someone who trains the beasts and have an unusual connection with them. Eren is great with all beasts, mostly dragons.
This is Levi.
Levi is royalty. His home has been attacked in a distant kingdom and everything he has ever known is now gone except his excitable Tewbit, Hanji.
Before his home was destroyed, his parents got wind of the news of this attack. They immediately sent Levi away to protect him. He arrived in an old run down building where his protector would come to pick him up and take him somewhere safe.
(I own the plot an story idea. I do not own the characters.)