Reja is an 11-year-old boy with a bit of a precocious way of speaking, and he happens to be the heir of the rich Dior family from Greek. He stuck close to his father and crossed over to Xandria, but decided to return ahead of time and boarded the the Lombardia on his own.
After the ship sank, he managed to stay alive by hanging onto the livestock Pikkard that were on the ship, then arrived to Seiren Island. After he was rescued and brought to Castaway Village, he was asked by Dogi to manage the farming area of the village. Despite disliking this task at first he became rather invested in taking care of the pikkards and crops.