Locket

This is Locket. He was meant to have a twin, but somehow he combined with his twin before they were born, causing him to become a "chimera." He feels a sense guilt for making his would be twin sister disappear, even though it isn't his fault...

To add to all of this, the nursery had made a two piece heart necklace for him and his sister. He wears one half and looks for someone willing to wear the other...