Rabbit

Rabbit spent most of his young life on the streets in a large city, he felt abandoned by the world and aimed to take revenge on the inhabitants. He roamed the streets and enjoyed causing general mischief. However one such instance led to the accidental death of a nobleman's son who hung out in the poor end of the city. Before he could react to mistakenly killing a man, he was approached by a shadowy person who thanked him for what he had done. They explained they were a part of Night Claw, which was a group of assassins for hire. They offer to train him and if he succeeds, he will be allowed to join their group. Rabbit agrees and finds throughout his training he's a pretty darn good assassin.